dimate change

The more I read about the trillionth ton (or tonne for our non-American friends), the more intrigued I am by its power to change the way we approach the threat of global warming. I wrote last week about the idea, which represents a whole new way of thinking about carbon emissions, but I'd like to take another stab at it, in hopes of spreading the meme further than my last post managed. The "trillionth ton" refers to the amount of carbon in the atmosphere. Before the invention of the steam engine and everything that followed since the middle of the 18th century, there was a certain amount of…