I was one of the first to think plastic bags were a bad idea in the grocery stores but we had to save the trees. We have now changed the term global warming into climate change because the earth actually cooled over the last few years. Scientists know that sunspot activity has more to do with the earth's temperature than anything man can do.
That doesn't mean the whole movement is a sham. We should be building and buying sustainable products. But a bamboo plate and fork in a plastic trash bag still fills up a landfill. So tread carefully. If you are buying recyclable products, make sure they are recycled. Send your extra food from your wedding to the local food bank or mission. Take the flowers to nursing homes (make sure you don't need to return the vase to the florist first). Instead of favors, make a charitable donation to a cause you believe in. And follow through. Make sure your wishes are going to be carried out. That's the true mission of environmental stewardship. Do what you can and see that it is done right. We can all make a difference, the smart way.