#Fossil leaves show high atmospheric carbon spurred ancient ‘global greening’
“#Fossil leaves show high atmospheric carbon spurred ancient ‘global greening’” A 23-million-year-old leaf preserved in a onetime New Zealand lake bed, key to past atmospheric conditions. One can see veins, glands along the teeth, and holes gnawed by insects, with resulting stunted growth and scar tissue. Credit: Jennifer Bannister/University of Otago Scientists studying leaves from…