I am grateful that my letter influenced his interest in global warming and climate change.
I don't believe he received my main message. This is a natural process governed by the laws of nature. To increase global temperature, heat must be added. Solar heat could increase or man can add heat to the globe.
Man is adding heat by burning fossil fuels, releasing stored energy or by nuclear generation, converting mass into energy, equivalent to about one percent of the solar heat received, enough to raise the global temperature about one degree. This is warming the globe and the first sign is the melting of the polar ice cap, short term temperature stabilizer.
The Earth's climate is set mainly by the solar heat, maximum at the equator and minimum at the poles. The heat and climate varies winter and summer due to the Earth's inclined axis of rotation. A third effect is the volatility of water vapor and heated air, creating winds carrying heat and water around the globe.
These cause local variations such as storms, hurricanes, tornadoes. Man's added one percent has a negligible effect here, mostly at the poles.