The new number will be put into action right away: the E.P.A. plans this spring to release final regulations to curb carbon dioxide from cars, trucks and power plants.
The impact on power plants should not be underestimated. This is a win, and hopefully we'll be able to ween ourselves off fossil fuels and coal more quickly if it hurts these power companies bottom line.
Hopefully this will also move into the private airplane business, and cruise line industry.
Cars will take more time, because we have to cycle the old fossil fuel engines for newer cars that just aren't cost effective right now. Not to mention, some people will want to keep their gas powered car.