I've seen most of the relevant science, and my father works closely with the issue. While I do think liberals abuse this as a hot-button issue, it is nevertheless an issue. The human impact of global warming is almost insignificant, especially compared to changes in orbital rotation. However, it is better to be safe than sorry in the long run. Making new products more eco-friendly would be wonderful, but forcing old products to meet new emissions standards would be counter-productive by merely making energy less affordable.