It touches all of us in many ways, from the air we breathe to the food we eat. If unchecked, it will ultimately end human civilization.
We have no choice but to address it. And each of us can take action to do so, in small and big ways.
But we have to start by learning about it. Thinking about it.
So that we can decide what actions we will personally take to make a difference. Spending some time on this site is a beginning.