Methane controls before risky geoengineering, please

Only about half the warming that has occurred up to now is due to CO2. The rest is caused by other greenhouse gases, particularly methane (Proceedings of the National Academy of Sciences, vol 97, p 9875). Similarly, less than half of the total warming expected over the next 20 years will be caused by CO2. Methane, along with other gases such as carbon monoxide, volatile organic compounds (VOCs) and black carbon particles, will cause most of the changes.

Recent modelling shows the way to have the biggest impact on warming over this century is to immediately reduce emission of these gases, and keep them low (International Journal of Climate Change Strategies and Management, vol 1, p 42).

New Scientist