The purpose of this post is to provide some science to back the standard set of climate change denial arguments that have been used by those who question climate science.
1. CO2 is not actually increasing.
Humans release roughly 29B tons of CO2 in the atmosphere every year. Vegetation and oceans absorb only 57%. Current CO2 levels are the highest in 15M years.
2. Even if CO2 is increasing, the increase has no impact on the climate since there is no convincing evidence of warming.
- Land surface air temperatures. This may be the least reliable data because of a number of local affects that could influence the accuracy of the instruments.
- Sea surface temperature. Lots of data going back to 1850 with the most recent decade as the warmest
- Air temperature over the oceans.
- Lower Troposphere temperature. Measured by satellites for 50 years. Every decade since 2000 is warmer than the previous one.
- Ocean Heat Content – 90% of the heat from climate change is being absorbed the by the ocean which is causing the sea levels to rise.
- Sea Level Rise.
- Specific Humidity
- Glacier retreat – now 25 consecutive years of net loss of glacier ice.
- Northern hemisphere snow cover.
- Arctic sea ice
3. Even if there is warming, it is due to natural causes.
This graph, though a little wonky, demonstrates that we have already exceeded the limits that could be attributed to natural variability. Basically all of the warming details listed above require some other source of warming besides natural causes.
4. Even if the warming cannot be explained by natural causes, the human impact is small, and the impact of continued greenhouse gas emissions will be minor.
5. Even if the current and future projected human effects on Earth’s climate are not negligible, the changes are generally going to be good for us.
The impacts of climate change are making things worse for biodiversity.
6. Whether or not the changes are going to be good for us, humans are very adept at adapting to changes; besides, it’s too late to do anything about it , and/or a technological fix is bound to come along when we really need it.
The most immediate and available technical solution is to stop releasing CO2 into the atmosphere and replace fossil fuels with non-polluting alternatives. If we simply stopped pumping oil today, we would have a change to avoid tumbling over into an irrecoverable greenhouse condition. The problem with other technical solutions is that there is little that can be done to prevent widespread destruction and political instability that will result from rising sea levels. The acidification of the oceans will kill much of the current sea life. The impacts of that can only be imagined. We will eventually run out of oil. The risk is by then are that the greenhouse effect will be self-sustaining.