On Mar 26, 12:02*am, "Lawrence Jenkins" wrote:
Has nuthin' to do : is this true , is the sun benign? How importatnt is it
in respect of how warm it keeps us and what grows?

The Sun is the source of 99.9% of the heat on the surface of the
Earth. But its strength varies over the sun-spot cycle. Moreover the
solar constant is not constant and has increased by 30% since the
Earth was formed, and is now refusing to recover from its last solar
minimum.

Cheers, Alastair.