This analysis is quite compelling, but in my opinion, it is weakened by three factors. First, it is heavily dependent on theory, and many of its conclusions are based on assumptions about the behavior of Earth systems, such as the AMOC, that have a good theoretical basis but little or no hard evidence and could therefore be wrong. Second, there is no recognition of the important role played by volcanic activity in natural systems. Explosive volcanoes are known to cool Earth by creating aerosols, which increase Earth’s albedo. Less well known is the fact that effusive volcanism is almost invariably… Read more »
Volcanoes can also contribute to global warming through the release of CO2 or triggering the release of methane hydrates or methane gas through geomorphological activities. And then with seismic uptake you could get potential disasters on a massive scale. Lesser impacts could mean impacts for aviation.
This analysis is quite compelling, but in my opinion, it is weakened by three factors. First, it is heavily dependent on theory, and many of its conclusions are based on assumptions about the behavior of Earth systems, such as the AMOC, that have a good theoretical basis but little or no hard evidence and could therefore be wrong. Second, there is no recognition of the important role played by volcanic activity in natural systems. Explosive volcanoes are known to cool Earth by creating aerosols, which increase Earth’s albedo. Less well known is the fact that effusive volcanism is almost invariably… Read more »
Volcanoes can also contribute to global warming through the release of CO2 or triggering the release of methane hydrates or methane gas through geomorphological activities. And then with seismic uptake you could get potential disasters on a massive scale. Lesser impacts could mean impacts for aviation.
Regarding carbon dioxide see http://www.realclimate.org/index.php/archives/2016/02/what-is-the-best-description-of-the-greenhouse-effect/
Alarmism is exactly what is required to ring the alarm bells, and Hansen has a very good track record from his past projections.