By LIZ SIDOTI
The Associated Press

WASHINGTON — Calling climate change an urgent challenge, President-elect Barack Obama promised Tuesday that Washington would take a leading role in combating it in the United States and throughout the world. “My presidency will mark a new chapter in America’s leadership on climate change,” Obama said in a video message to governors and others attending a Los Angeles summit on the issue.

In the roughly four-minute message, Obama reiterated his support for a cap-and-trade system approach to cutting green house gases. He would establish annual targets to reduce emissions to their 1990 levels by 2020 and reduce them another 80 percent by 2050. Obama also promoted anew his proposal to invest $15 billion each year to support private sector efforts toward clean energy.

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