Over the years, I’ve learnt some interesting facts about the atmosphere and climate change…
- Water vapour is evaporated from the seas, which covers 70% of the global surface area.
- The warmer the air is, the more water vapour it can hold. [1,2]
- The more water vapour there is in the atmosphere, the more cloud cover exists.
- Cloud cover blocks sunlight, reducing global warming.
Conclusion 1: atmospheric temperature is naturally regulated by water vapour.
- Increased atmospheric water vapour increases precipitation (rainfall).
- Increased rainfall increases plant growth.
- Increased carbon dioxide concentration increases plant growth. 
- Increased atmospheric temperature ALSO increases plant growth.
Conclusion 2: “global warming” creates a greener planet. This is a good thing.
Arctic sea ice
- Arctic ice is floating sea ice
- Floating ice displaces the same volume as melted ice. 
Conclusion 3: melted Arctic ice will not contribute to rising sea levels.
Inland glacial ice
- The worst-case scenario projections of global warming/climate change estimate that the atmospheric temperature will increase by 5C over the next 100 years. Most estimates indicate a 2C rise over the next 100 years. 
- The average coastal temperature of Antarctica is -10C. The majority of Antarctic ice is much further inland, where temperatures are much much colder (in excess of -50C). 
- Greenland’s ice sheet has an average temperature of -12C in summer. 
Conclusion 4: “Climate Change” will not melt either Greenland or Antarctic land ice.
- Increased atmospheric water vapour increases precipitation.
- Increased precipitation increases polar ice.
- The vast majority of precipitation water is evaporated seawater.
Conclusion 5: As “global warming” increases polar ice, it may even lead to sea levels falling.
Greenhouse effect of CO2
- The greenhouse effect of CO2 is logarithmic . This means that every doubling of CO2 concentration will only increase the greenhouse effect by 1.5%.
- In the last 150 years, global CO2 concentration has risen by about 30%.
- In the last 150 years, average global atmospheric temperature has risen by 1C.
- Assuming a worst-case scenario, that all the temperature rise caused by human CO2 emissions: 30% increase in CO2 concentration corresponds to 1C rise. This means that a temperature rise of 3C would require increasing CO2 concentration by 120% – that’s an increase of 336ppm.
- We have only increased atmospheric CO2 by 100ppm since the dawn of the industrial revolution.
Conclusion 6: We are nowhere near to increasing the atmospheric temperature by 3C.
The biggest greenhouse gases
- Water vapour is by far the most significant greenhouse gas, estimated at 60% of overall greenhouse effect. 
- There is no way to control water in the atmosphere.
- CO2 contributes 26% to the overall greenhouse effect.
- Human activity contributes only about 4% of global CO2 emissions (29 gigatons per year compared to 750 gigatons of natural CO2 emissions). 
Conclusion 7: Human activity has very little effect on global warming.
So what do you think? Does this make you feel less alarmed about climate change? Feedback and corrections welcome.
This post was originally published by the author, Hoong-Wai on his personal blog: https://hoongwai1984.wordpress.com/2020/01/30/fun-facts-about-climate-change/