[patrickg_zill]

1. Very few talk about how the sun changes its levels of radiance and how this affects climate on Earth. The sun is not a "constant".

2. Maybe I phrased that part of my statement rather lumpily. I meant, if USA spends to reduce emissions and China and India do not spend.

[SamPhillips]

1. They don't talk about it because it is not the primary cause of the warming we see. [0] 2. China and India have agreed to reduce emissions, as part of the Paris agreement. 45% of all solar installed worldwide in 2016 was installed in China. Every country needs to do its part. [1]

https://www.bloomberg.com/graphics/2015-whats-warming-the-wo... https://en.wikipedia.org/wiki/Solar_power_by_country