Comments by "Kate S" (@KateeAngel) on "When It Was Too Hot for Leaves" video.

  1. In the past change of 0.01 ppm CO2 per year was "fast". It accumulated over 10 of millions of years to create a huge drop or rise. Nowadays the change is 2-2.5 ppm per year
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  2. First of all, in the winter water in the ground is frozen, and plants cannot use it, but large leaves would still continue to lose water through evaporation, and the plant would lose water. Second, large leaves accumulate more snow on them, and that could break a tree. Even without leaves in winter many younger birch trees bend or break when there is a lot of snow. Third, large amounts of soft tissue, like in leaves could freeze and be damaged easier and pathogens could get in through the damaged leaves
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  3. Look up any paleo art of Archean Eon
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  4. Solar irradiation gradually rise over the 100s of millions of years. If Earth had the same atmosphere as now 1 or 2 billion years ago, it would be a perpetual snowball
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