As a Catholic, I do feel a moral obligation to try my best to be a good steward of God's creation. If we wait to take action until the debate over global warming has been settled it may very well be too late.
"PRAY and reflect on the duty to care for God's creation and for the poor and vulnerable;
LEARN about and educate others on the moral dimensions of climate change;
ASSESS our participation-as individuals and organizations-in contributing to climate change (i.e. consumption and conservation);
ACT to change our choices and behaviors contributing to climate change and;
ADVOCATE Catholic principles and priorities in climate change discussions and decisions, especially as they impact the poor and vulnerable."
I also believe it's important for the Church to make its voice heard on this issue to make sure that any proposed government action does not conflict with Catholic doctrine. There are many environmental activists who would like to see family size limited in the name of "saving the planet". Catholics need to ensure that the focus is on reducing consumption through simpler and more sustainable living rather than fewer births.
Let's lead by example that families do not have to be small to be "green"!