Scientists are declaring that the earth is warming up faster than they had predicted and are making the assertion that the acceleration is caused by human activity. Check out Debate on Climate Shifts to Issue of Irreparable Change
"While scientists remain uncertain when such a point might occur, many say it is urgent that policymakers cut global carbon dioxide emissions in half over the next 50 years or risk the triggering of changes that would be irreversible."
People and animals emit a whole lot of carbon dioxide too. Perhaps we are a bit too overpopulated... I read an article about vegetarianism cutting global warming in my New Scientist Magazine. The article isn't on their website, so I shall transcribe some of it.
From "Green Your Diet Before Your Car"(New Scientist, Dec 17-23, 2005): (A study from the U of Chicago) says "you can do more for the planet by going vegan."
They compared the amount of fossil fuel needed to cultivate and process various foods, including running agricultural machinery, providing food for livestock and irrigating crops. They also factored in emissions of methane and nitrous oxide produced by cows, sheep and manure treatment.So if you really must drive an SUV, then you can do your part by giving up meat. Who knew?
The typical US diet, about 28% comes from animal sources, generates the equivalent of 1.5 tons more carbon dioxide per person than a vegan diet with the same number of calories, say researchers...
By comparison, the difference in annual emissions between driving a typical car and a hybrid car is just over 1 ton.
Uh oh, New Scientist also has an article about vegetation. not vegetarianism. Plants and vegetation don't only give off methane gas when they rot, as was commonly believed, they gives off methane gas in general. It accounts for 10-30% of all the methane pumped into the atmosphere!
Damned if you do. Damned if you don't.
Update: Clinton: Climate Change World's Biggest Concern
Someone should tell him how unAmerican he is.