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NC – AT: Warming Inevitable



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2NC – AT: Warming Inevitable

Action mitigates the worst impact, every degree matters, and there’s no such thing as “irreversible” loops.


Goodstein ’19 [Eban; June 2019; Director of the Center for Environmental Policy and the MBA Program in Sustainability at Bard College, Ph.D. in Economics from the University of Michigan, B.A. in Geology from Williams College; Lead The Change, “Too Late to Stop Global Warming? A Response to Franzen,” https://leadthechange.bard.edu/blog/too-late-to-stop-global-warming-a-response-to-franzen]
So do we need to look Greta Thunberg and our other children in the eyes and say, sorry, but you need to be realistic? That a transition to a 100% clean energy economy is just not going to happen fast enough? That the global economy will soon collapse and billions of people will be homeless? Tell them, forget aggressive measures to cut emissions like the Green New Deal, focus instead on social adaptation?
No.
Climate despair is gaining dangerous traction among people who understand the profound moment in which we are living. But Franzen is wrong on the science, wrong on the impacts of two degree warming, and wrong on what it will take to stabilize the climate. And this is precisely the wrong historical moment to abandon belief in a finer future. Climate solutions are now cheaper then fossil fuels, and getting cheaper. People are embracing programs and initiatives around environmental education. It lies within our grasp to rewire the world with clean energy. Doing so in the next decade will deeply impact the lives not only of our children and grandchildren, but indeed, every human being and living creature who will walk the face of the planet, from now until the end of time.
Is it too Late to Stop Global Warming?
NASA scientist Jim Hansen introduced the “too late” language about climate change in 2005, arguing that “We have to stabilize emissions of carbon dioxide within a decade, or temperatures will warm by more than one degree [C].” We did not, and his prediction is now reality. Hansen also warned fifteen years ago, “we don’t have much time left”.
Last year, the IPCC set another guide-post. Holding temperatures to 1.5 degrees Celsius will require a clean energy transition to be far advanced by 2030. And to keep temperatures to 2 degrees Celsius we have until 2050 to largely decarbonize the global economy. When scientists say “too late” on climate change, what they mean simply is that we have foreclosed any likelihood of staying within a particular global warming temperature target.
If governments take no serious action at all in the coming few decades, then we are likely to wind up at between 3 and 5 degrees Celsius of heating. To put that last number in perspective, during the last Ice Age, when my hometown in New York state was covered by hundreds of meters of ice, the world was only 5 degrees Celsius colder than it is now. Unchecked we are on track for a warming that could easily hit Ice Age magnitude, only in the opposite direction, within the lifetime of my students.
So we do have a choice. Our action, or our inaction, will determine how much the world heats up. As detailed below, it is absolutely not too late, and will not be for decades. We have to fight and win a war now for clean energy, acting aggressively to hold global warming to the low end. A world that is 2 degrees hotter will be much, much better than one that is 3, 4 or 5. Every tenth of a degree will matter for our kids and grandkids.
No Runaway Greenhouse at 2 Degrees
So how can Franzen and others possibly say we should admit defeat? His main argument is that this possibility of holding future heating to a range, from 2 to 5 degrees, does not really exist. Instead, we are already headed across a tipping point:
“Our atmosphere and oceans can absorb only so much heat before climate change, intensified by various feedback loops, spins completely out of control. The consensus among scientists and policy-makers is that we’ll pass this point of no return if the global mean temperature rises by more than two degrees Celsius (maybe a little more, but also maybe a little less)… In the long run, it probably makes no difference how badly we overshoot two degrees; once the point of no return is passed, the world will become self-transforming.”
Here are the key lines: “The consensus among scientists and policy makers” is that above 2 degrees Celsius or a little more, the climate “spins completely out of control”. This is just wrong, and Franzen provides no evidence to back up this extraordinary claim. Yes, positive feedback loops like widespread, fire-driven deforestation or massive methane releases could collectively drive the planetary temperature upwards in an ever less controllable spiral. These are possibilities, risks we need to reduce. Indeed, the risks get higher the more global warming pollution we emit, yet another critical reason to aggressively reduce it now. But I know of no scientific sourcelet alone a “consensus”—maintaining that such a “self-transforming” runaway greenhouse scenario is inevitable or that it will be triggered at close to 2 degrees Celsius. Without this assertion, Franzen’s “too late” argument falls apart. Four degrees will be far worse then three, which will be far worse then two. So we have to fight like hell today for two or better.

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