"There's much we know and can agree on around the
climate change issue," says Rex Tillerson, ExxonMobil
 CEO, "and there’s much that we just don’t believe we
do know … and we want to have a debate about the
things we know and understand, the things we know
about that we don’t understand very well, and the

things we don’t even know about around this
very complex issue of climate science. So that is
what will continue to be our position until we
change it."