"Greenhouse gases" in Par

A．Americans do not understand their own heritage and culture well
B．the author does not mind Americans' cultural blindness
C．Americans pay little attention to foreign customs and languages
D．America has no problems in the world because it's the most powerful country

A．decode the mystery of life
B．predict the formation of a new supercontinent
C．adjust the planet's climate
D．prevent another Snowball Earth from happening