After studying environmental issues for decades, I feel responsible to wake up as many people as possible to the fact that procrastinating on climate change is a horrific mistake. If we wait to reduce our greenhouse-gas emissions drastically, we will make it virtually impossible to reverse, stop, or even slow global warming. Why? Because the current level of warming has already begun to trigger positive-feedback mechanisms, and, as the temperature goes up, those mechanisms will trigger more mechanisms, and then the warming will continue to accelerate to levels we don’t even want to think about.
As The Guardian explains:
Scientists are aware of a number of positive feedbacks loops in the climate system. One example is melting ice. Because ice is light-coloured and reflective, a large proportion of the sunlight that hits it is bounced back to space, which limits the amount of warming it causes. But as the world gets hotter, ice melts, revealing the darker-coloured land or water below. The result is that more of the sun’s energy is absorbed, leading to more warming, which in turn leads to more ice melting – and so on.
You can find another positive-feedback example, the release of methane as permafrost melts, in one of my earlier blogs. That post is entitled: IN WHICH I RANT IN CAPITAL LETTERS. Here’s a link to that post: https://sallywengrover.wordpress.com/2014/08/09/in-which-i-rant-in-capital-letters/
For lighter look at positive feedback, you might check out “The Sorcerer’s Apprentice,” from Fantasia. Here’s a link to it: https://www.youtube.com/watch?v=Ait_Fs6UQhQ
Below, you’ll find links to a couple of recent articles about where we now stand in regard to global warming.