Recently scientists issued a statement indicating the world's atmospheric carbon dioxide level had reached 400 parts per million. Prior to the industrial revolution the level was 280 parts per million.
For those concerned about climate change, this is an alarming threshold. We don’t know yet what it will mean in the coming decades, but the last time the CO2 level was this high in the atmosphere about two and a half million years ago, the Earth was a much warmer, much different place.
Those who have been concerned about climate change have been talking about this and some have taken action. One of those people lives here in Michigan.