Justine asks:
"how do we get them to start playing the environment card?"

Pay them in cash.
Tell them that it is favoured by corporate CFOs.
Tell them it will make Hillary Clinton livid.
Tell them if they do so they get free Viagra.

Given 2000 years of Christian history how many times in those 20 millenia can you point to historical fact and demonstrate that they made a clear difference in anything that lasted more than one or two generations?

They are an abyssmal failure at everything except their true purpose ... which is what they do quite well ... control people's actions in public.
DA Morgan