If you hang out for a while in down town Los Angeles on a roof top of a high rise, you can see this all the time. They introduced falcons and other birds to deal with the pigeon population. Loads of fun to see one get taken out!
Here's a cool article about it
http://www.terrain.org/articles/6/rowland.htm
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Carbon is not the problem, it makes up 0.041% of our atmosphere , 95% of that is from Volcanos and decomposing plants and stuff. So people in the US are responsible for 13% of the carbon in the atmosphere which 95% is not from Humans, like cars and trucks and stuff and they want to spend trillions to fix it while Solar Panel plants are powered by coal plants
think about that