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Even as we urge caution against climate alarmism, we ought not to be complacent against real dangers of which we do not yet have accurate measure. For as host of technical reasons, our retrospective calculations of past and the science of current CO2 levels and their climate effects are decidedly imperfect. In addition, there are confounding influences.

For example, although volcanoes produce CO2, they also produce ash and sulfur dioxide, which have cooling effects. Other sources of climate variation include variations in solar output, the details of cycles of the earth's orbit, and meteorite and comet impacts. The last is implicated but not yet proven as the cause of the Younger Dryas, a notable rapid cooling that took place about 12,900 years ago.

Entirely apart from a warming climate, the vast output of CO2 is thought to be acidifying the oceans and endangering marine life.

In the end, in addition to a carbon reduction strategy, geoengineering may be needed. When the left begins urging that step, we will know that even they believe their climate alarmism.

In the end, in addition to a carbon reduction strategy, geoengineering may be needed. When the left begins urging that step, we will know that even they believe their climate alarmism.

In the end this whole thing is an attempt to enslave men. Making public policy on the supposed fact that maybe the earth's atmosphere may heat up a whole degree 200 years from now? Insanity. Talking about UFO's used to get you thrown into the loony bin. It should be the same for "global warming".

Entirely apart from a warming climate, the vast output of CO2 is thought to be acidifying the oceans and endangering marine life.

Not particularly. The manmade drop in pH is about 0.02 pH units per decade: http://www.biogeosciences.net/12/1223/2015/ so not a particular concern in the short run because that is far less than natural fluctuations.