It's good that you have found something to care about, it may lead you to a future career or volunteer opportunity. But please don't freak out that the Earth is going to be destroyed in a couple of years.
25 years ago I was told by my grade school teachers that we were entering global cooling, and icebergs and glaciers were going to take over the Earth. (Not a joke, google newsweek and global cooling for a good laugh.)
20 Years ago I was told by my middle school teachers that the rainforest would be entirely gone in 10 years. ( I personally visited it, it's still there.)
10 years ago I was told by my High School teachers that the hole in the ozone would make it deadly to step outside in 10 years.
Yet I am still alive, able to go outside without dying or turning blind, and I visited the rainforest that isn't supposed to exist.
Not to mention acid rain, alar in the apples, killer bees, killer ants, killer hurricanes, killer earthquakes, killer tornadoes, SARS, mad cow disease, the Bird flu, H1N1 influenza type A, mercury poisoning, the threat of extinction of every animal ever known or unknown, global warming, global climate change, the shifting of the poles, 2012, radon in our houses killing us, etc.
Please ignore the fear mongering, find a local problem that you an help with. You can't save the whole planet, and it's hardwork to research what is truthful and what is not. Don't let the adults freak you out, find a way to help your community without going into some sort of panic.
Perhaps there is a local park or river that has trash that you and your friends could clean up. Or you can start or improve the recycling system at your school. Or you can collect and recycle those CFL lightbulbs that contain dangerous Mercury that are being tossed in the garbage because most people don't know that they should be recycled. (Or where to recycle them.)