How are we affected by CO2?

We are going down the path of CO2 output regulation. We want to penalize companies that produce CO2. This is done with the intent of improving the environment. Let's refer to the experts in weather science and see what is the role of CO2 in our environment.

“Many chemicals are absolutely necessary for humans to live, for instance oxygen. Just as necessary, human metabolism produces by-products that are exhaled, like carbon dioxide and water vapor. So, the production of carbon dioxide is necessary, on the most basic level, for humans to survive. The carbon dioxide that is emitted as part of a wide variety of natural processes is, in turn, necessary for vegetation to live. It turns out that most vegetation is somewhat ’starved’ for carbon dioxide, as experiments have shown that a wide variety of plants grow faster, and are more drought tolerant, in the presence of doubled carbon dioxide concentrations. Fertilization of the global atmosphere with the extra CO2 that mankind’s activities have emitted in the last century is believed to have helped increase agricultural productivity. In short, carbon dioxide is a natural part of our environment, necessary for life, both as ‘food’ and as a by-product.” - Roy Spencer, Ph.D. Meteorology