But is that enough energy to cause damage? Its clearly not a huge problem otherwise cases with camera covers would probably be common.
I don't think its worth most users worrying about it. But definitely don't point your camera at the sun on purpose.
4g of CO2 per email? I find that hard to believe. Probably overestimating emissions like some media did with Netflix.
https://www.iea.org/commentaries/the-carbon-footprint-of-streaming-video-fact-checking-the-headlines