Given the following facts, how can you can argue that rising CO2 is bad for the environment?
* During the vast majority of Earth's history, there were no polar ice caps at all. The only reason our planet currently has ice caps is because we are still emerging from the most recent ice age. When the earth is in its "more normal" state of having no permanent ice, sea level is about 610 feet (186 meters) higher than it was 20,000 years ago, and 210 feet (64 meters) higher than it is today.
* When Antarctica iced up there was a large-scale extinction event. The creation of the Antarctic ice cap was NOT good for life.
* "Millions of years ago, Antarctica was warmer and much wetter, and supported the Antarctic flora, including forests of podocarps and southern beech." ( https://en.wikipedia.org/wiki/... ) "During the Eocene–Oligocene extinction event about 34 million years ago, CO2 levels have been found to be about 760 ppm and had been decreasing from earlier levels in the thousands of ppm." ( https://en.wikipedia.org/wiki/... )
* So there you have it: when life was thriving, the CO2 level was thousands of parts per million. The CO2 level in June 2015 (as humans are well along in the process of transitioning away from fossil fuels): 402 parts per million
* Also keep in mind that every species that's alive today, including polar bears, survived the comings and goings of dozens of ice ages.