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originally posted by: Look2theSacredHeart
Thinking climate change is a right-left issue just shows we Americans don't even read international news. How can we have a firm grasp on science if we don't even pay attention to Canada?
Google translate can give you a glimpse of what is happening (and information on climate change) outside the U.S. And the translations are often hilarious.
it about those who are aware of the problem and those who are ignorant and unwilling to accept there is even a problem to begin with.
Never in geo record is there an point in time where CO2 increased 40% in half a century.
originally posted by: jrod
a reply to: johnwick
Are you going to try to tell us that an observed 40% increase of CO2 concentrations over the past half century is not a significant one?
originally posted by: Quetzalcoatl14
originally posted by: johnwick
a reply to: FyreByrd
Oh look another bash righty thread made by a lefty, wow how original.
Psst. Don't know if you know this, but you pitical trolls throwing up baited threads are getting sooooooo boring.
The lefties are all idiots.
The eighties are all idiots.
Us not indoctrinated by a idiotic political ideology are all very put off by your constant zealot level blind obedience.
Plz stop!!!!
Plz!!!!
We get it, you think the right are evil, because they don't believe your religion.
So what!!!!
Why is it so important that you get to force your religion on them?
No wonder the lefties like Islamic extremists so much, you guys run with the exact same MO.
Believe as we demand or else!!!!!!
It's not an issue of "belief," but science and evidence. The old saying goes, "you are welcome to your own opinion but not your own facts."
We do have a right to deride anyone who denies hefty serious scientific evidence supporting a major threat to all of us, not just you or a small group. We do have a right to say something if a group (mostly Republicans) either denies that there is a problem or refuses to do anything about it.
At that point, assuming climate change is a real threat, such people actually threaten my own children and community, as they are blocking action against a threat that affects us all.
originally posted by: jrod
a reply to: johnwick
You are comparing apples to oranges. Never in geo record is there an point in time where CO2 increased 40% in half a century.
What is happening now on the planet will likely appear as an anomaly on the geo-records. The amount of CO2 and other stuff we release in the atmosphere is truly mind blowing.
Grim, I respect your contributions in the discussions on this sight.
I think you are very!!!! Intelligent!!!!
But you are honestly going to try to tell me that a over thousand fold increase in co2 ( the devil) combined with a 4% decrease in solar activity is the same example as.
Thousands of times less of co2 ( the dreaded trace gas of death) combined with 4% more solar output is a dead mans scenario?
Come on man!!!!
originally posted by: coastlinekid
a reply to: jrod
it about those who are aware of the problem and those who are ignorant and unwilling to accept there is even a problem to begin with.
No it is NOT about that,... it is about how one perceives the influence of man on this planet...NOT if man ignores our influence...
Never in geo record is there an point in time where CO2 increased 40% in half a century.
Ooo... half a century,... that is like, gee maybe a whole second in real earth time...get over yourself!... arrogance is a two way street... you think climate change deniers are arrogant because they seem to not acknowledge the concept of "climate change"
It is equally arrogant to think you know what really affects the earth on a scale that covers BILLIONS of years...we humans are but a speck, and to think that our smoke stacks and car exhaust and plastic cups are going to forever destroy this great planet is pathetically self-important in the grand scheme... me thinks...
originally posted by: coastlinekid
Ooo... half a century,... that is like, gee maybe a whole second in real earth time...get over yourself!... arrogance is a two way street... you think climate change deniers are arrogant because they seem to not acknowledge the concept of "climate change"
It is equally arrogant to think you know what really affects the earth on a scale that covers BILLIONS of years...we humans are but a speck, and to think that our smoke stacks and car exhaust and plastic cups are going to forever destroy this great planet is pathetically self-important in the grand scheme... me thinks...
You are comparing apples to oranges. Never in geo record is there an point in time where CO2 increased 40% in half a century.
What is happening now on the planet will likely appear as an anomaly on the geo-records. The amount of CO2 and other stuff we release in the atmosphere is truly mind blowing.
originally posted by: coastlinekid
again,... get over yourself...
A large number of ancient mass extinction events have been strongly linked to global climate change. Because current climate change is so rapid, the way species typically adapt (eg - migration) is, in most cases, simply not be possible. Global change is simply too pervasive and occurring too rapidly.
Humans are transforming the global environment. Great swathes of temperate forest in Europe, Asia and North America have been cleared over the past few centuries for agriculture, timber and urban development. Tropical forests are now on the front line. Human-assisted species invasions of pests, competitors and predators are rising exponentially, and over-exploitation of fisheries, and forest animals for bush meat, to the point of collapse, continues to be the rule rather than the exception.
Driving this has been a six-fold expansion of the human population since 1800 and a 50-fold increase in the size of the global economy. The great modern human enterprise was built on exploitation of the natural environment. Today, up to 83% of the Earth’s land area is under direct human influence and we entirely dominate 36% of the bioproductive surface. Up to half the world’s freshwater runoff is now captured for human use. More nitrogen is now converted into reactive forms by industry than all by all the planet’s natural processes and our industrial and agricultural processes are causing a continual build-up of long-lived greenhouse gases to levels unprecedented in at least the last 800,000 years and possibly much longer.
Clearly, this planet-wide domination by human society will have implications for biological diversity. Indeed, a recent review on the topic, the 2005 Millennium Ecosystem Assessment report (an environmental report of similar scale to the Intergovernmental Panel on Climate Change Assessment Reports), drew some bleak conclusions – 60% of the world’s ecosystems are now degraded and the extinction rate is now 100 to 1000 times higher than the “background” rate of long spans of geological time. For instance, a study I conducted in 2003 showed that up to 42% of species in the Southeast Asian region could be consigned to extinction by the year 2100 due to deforestation and habitat fragmentation alone.
Given these existing pressures and upheavals, it is a reasonable question to ask whether global warming will make any further meaningful contribution to this mess. Some, such as the sceptics S. Fred Singer and Dennis Avery, see no danger at all, maintaining that a warmer planet will be beneficial for mankind and other species on the planet and that “corals, trees, birds, mammals, and butterflies are adapting well to the routine reality of changing climate”. Also, although climate change is a concern for conservation biologists, it is not the focus for most researchers (at present), largely I think because of the severity and immediacy of the damage caused by other threats.
Global warming to date has certainly affected species’ geographical distributional ranges and the timing of breeding, migration, flowering, and so on. But extrapolating these observed impacts to predictions of future extinction risk is challenging. The most well known study to date, by a team from the UK, estimated that 18 and 35% of plant and animal species will be committed to extinction by 2050 due to climate change. This study, which used a simple approach of estimating changes in species geographical ranges after fitting to current bioclimatic conditions, caused a flurry of debate. Some argued that it was overly optimistic or too uncertain because it left out most ecological detail, while others said it was possibly overly pessimistic, based on what we know from species responses and apparent resilience to previous climate change in the fossil record – see below.
A large number of ancient mass extinction events have indeed been strongly linked to global climate change, including the most sweeping die-off that ended the Palaeozoic Era, 250 million years ago and the somewhat less cataclysmic, but still damaging, Palaeocene–Eocene Thermal Maximum, 55 million years ago. Yet in the more recent past, during the Quaternary glacial cycles spanning the last million years, there were apparently few climate-related extinctions. This curious paradox of few ice age extinctions even has a name – it is called ‘the Quaternary Conundrum’.
Over that time, the globally averaged temperature difference between the depth of an ice age and a warm interglacial period was 4 to 6°C – comparable to that predicted for the coming century due to anthropogenic global warming under the fossil-fuel-intensive, business-as-usual scenario. Most species appear to have persisted across these multiple glacial–interglacial cycles. This can be inferred from the fossil record, and from genetic evidence in modern species. In Europe and North America, populations shifted ranges southwards as the great northern hemisphere ice sheets advanced, and reinvaded northern realms when the glaciers retreated. Some species may have also persisted in locally favourable regions that were otherwise isolated within the tundra and ice-strewn landscapes. In Australia, a recently discovered cave site has shown that large-bodied mammals (‘megafauna’) were able to persist even in the arid landscape of the Nullarbor in conditions similar to now.
However, although the geological record is essential for understanding how species respond to natural climate change, there are a number of reasons why future impacts on biodiversity will be particularly severe:
A) Human-induced warming is already rapid and is expected to further accelerate. The IPCC storyline scenarios such as A1FI and A2 imply a rate of warming of 0.2 to 0.6°C per decade. By comparison, the average change from 15 to 7 thousand years ago was ~0.005°C per decade, although this was occasionally punctuated by short-lived (and possibly regional-scale) abrupt climatic jolts, such as the Younger Dryas, Dansgaard-Oeschger and Heinrich events.
B) A low-range optimistic estimate of 2°C of 21st century warming will shift the Earth’s global mean surface temperature into conditions which have not existed since the middle Pliocene, 3 million years ago. More than 4°C of atmospheric heating will take the planet’s climate back, within a century, to the largely ice-free world that existed prior to about 35 million years ago. The average ‘species’ lifetime’ is only 1 to 3 million years. So it is quite possible that in the comparative geological instant of a century, planetary conditions will be transformed to a state unlike anything that most of the world’s modern species have encountered.
C) As noted above, it is critical to understand that ecosystems in the 21st century start from an already massively ‘shifted baseline’ and so have lost resilience. Most habitats are already degraded and their populations depleted, to a lesser or greater extent, by past human activities. For millennia our impacts have been localised although often severe, but during the last few centuries we have unleashed physical and biological transformations on a global scale. In this context, synergies (positive or self-reinforcing feedbacks) from global warming, ocean acidification, habitat loss, habitat fragmentation, invasive species, chemical pollution (Figure 2) are likely lead to cascading extinctions. For instance, over-harvest, habitat loss and changed fire regimes will likely enhance the direct impacts of climate change and make it difficult for species to move to undamaged areas or to maintain a ‘buffer’ population size. One threat reinforces the other, or multiple impacts play off on each other, which makes the overall impact far greater than if each individual threats occurred in isolation (Brook et al 2008).
D) Past adaptation to climate change by species was mainly through shifting their geographic range to higher or lower latitudes (depending on whether the climate was warming or cooling), or up and down mountain slopes. There were also evolutionary responses – individuals that were most tolerant to new conditions survived and so made future generations more intrinsically resilient. Now, because of points A to C described above, this type of adaptation will, in most cases, simply not be possible or will be inadequate to cope. Global change is simply too pervasive and occurring too rapidly. Time’s up and there is nowhere for species to run or hide.