Exhaling is bad for the Environment?

CO2, Carbon Dioxide, is both good and bad for you. There are two types of CO2, one is Natural, and one is Artificial. Natural is what you exhale, and is absorbed by Plants and Oceans, and Artificial is more difficultly absorbed by plants and oceans, and in large amounts, nature can absorb almost no CO2.
Over time, (say, 30 years) a whole is created in the atmosphere, which rises the worldwide temperature, which makes the plants and oceans go crazy, in fact, they say when global warming hits its full effect, Antarctica and the North Pole will melt, which will turn the ice into water, rising ocean levels worldwide, which will sink all of the coastal cities in the world, like New York, Los Angeles, Tokyo, Seoul, and many more. We are talking hundreds of millions of people here, and if we don't get our CO2 level back down to 350, it is not going to be good.
There was a guest on Colbert (who by the way I challenge to a blog-off, and I am doing that because he doesn't even have a blog, so I challenge you, Stephen Colbert) a few days ago, and he was from 350.org.
And being the good person that I am, I went on this website. And it defines what I am talking about in this article.
It says on it has on it's home page the first part of a whole article (most of which they talked about on Colbert) and, although I can not quote everything on the front page, based on simple copyright laws, I can say certain themes.
And what it said was this:
(written as though it the average activist to the average person in the world), most people in the world are aware of global warming, and that all of the people in the world know that what ever it is, it needs to be stopped. But then it ends with a hopeful message, saying that it can be achieved.
I couldn't read beyond the sample that was given on the homepage, because the link didn't open, but I think that that pretty much summed it up.
The climate crisis is one of the biggest troubles in the world today, and I appreciate the efforts of 350.org.
My opinion, along with everyone in the world, (accept the Bush-Cheney administration) is that global warming is bad.
Post questions and comments as comments
Sam