It
appears from paleo - science that there is more to it than that, the clouds that they generate as a control mechanism on the earth's temperature, this is yet another feedback mechanism for survival of all life on the planet and has been working for aeons of time, right back to the earliest life here... the planet was made more hospitable to life by life itself, geo - engineering on grand scale by the
tiniest of
plants in the sea... which outstrips the cleverest of plans by humans to geo - engineer and more relevantly does no harm to the planet...