The vast majority of green voters are Christian. Apparently, there just are not enough of them. One must also keep in mind that environmental issues have not historically split along party lines. Before their assimilation by the religious right, the Republican Party used to be the environmental party.
Here is an article from the Associated Press that pretty much sums up the looming "creation care" dilemma:
Dewitt said evangelicals will not call themselves environmentalists. They are going to call themselves pro-life ... But pro-life means life in the Arctic, the life of the atmosphere, the life of all the people under the influence of climate change ... Robinson said he voted for Bush in 2004 because of his opposition to abortion, but it was a tough decision, making him feel he was voting against the environment. If the conservatives want the Christian vote, they are going to have to address this ... The pastor feels like Noah cutting his first tree to build the Ark.
How ironic, cutting trees to build an ark. And there is this: