Environment

The free market has eliminated environmental hazards in the past, from leaded gas to acid rain, and it can solve the problem of climate change today. A cap-and-trade system offers the best hope for reducing pollution and encouraging green growth.

The Copenhagen conference won't solve the problem of climate change once and for all. Rather than aiming for a broad international treaty, negotiators should strengthen existing national policies and seek targeted emissions cuts in both rich nations and the developing world.

The Arctic is rich in natural resources and lies at the epicenter of a rapidly changing climate -- and it is time the United States paid more attention to the region.

The United States can curb its own emissions and encourage energy efficiency and the development of clean-energy technology worldwide by rethinking carbon regimes.