Lawmakers, scientists and advocates in the U.S. intensified calls Tuesday to immediately cut emissions from climate-warming soot — also known as black carbon — as deadlock continues in Congress over far more complicated regulation of carbon dioxide.

"Black carbon is an important, fast-action tool in mitigating long-term warming," said Veerabhadran Ramanathan, one of the world's leading climate scientists, in testimony before the House Select Committee for Energy Independence and Global Warming.

Although not a greenhouse gas, soot has emerged as a leading contributor to rising temperatures worldwide, scientists say. Limiting these emissions is seen as a relatively cheap and quick way to reign in warming in the short term.

The United States should act fast to build up the country's manufacturing industry for renewable energy systems or risk losing green jobs to China and other low-wage nations, according to a new report by advocacy organization Apollo Alliance and Good Jobs First, a labor-oriented research group.

The report's recommendations include fixing the nation's renewable energy stimulus funding so recipients who relocate operations overseas are forced to repay their hefty government handouts.

"We don't currently have the capacity to supply our own demand for clean energy products and systems," Sam Haswell, spokesperson for Apollo Alliance, told SolveClimate.

The U.S. is currently importing about 70 percent of its renewable energy parts from foreign countries, according to the report. If that continues, the report estimates, the U.S. will lose out on 100,000 clean energy manufacturing jobs and nearly 250,000 by 2030.

President Obama laid out an all-of-the-above energy policy in a speech to national business leaders this afternoon: America need nuclear, solar, energy efficiency, and expanded oil and gas production, he said, and “to truly transition to a clean energy economy, we need to put a price on carbon pollution.”

His words suggest White House support for the framework Sens. John Kerry (D-Mass.) and Lindsey Graham (R-S.C.) are using to write a compromise climate and energy bill.

The wildcard, of course, for that bill — which could be introduced as early as next month — and for any Senate action remains the price on carbon.

If you think IT and sustainability are two totally different worlds, think again.

Most of what is referred to as “smart” these days — smart transportation, the smart grid and smart cities, for example — is made intelligent by processors, sensors and analytical software, and of course the servers that make it all possible. So it’s not surprising to see tech giants like IBM wanting to create a smarter planet, Cisco wanting to craft smart tech solutions for utilities and companies, and plenty of other, smaller companies wanting a piece of the action.

But while the money and hoopla surrounding all things smart can cloud the issue a bit, the point is that infrastructure in this country is sorely in need of an overhaul. In its Smarter Cities Virtual Leader Forum today, IBM recapped what it’s doing to make education, transportation, government, energy and healthcare smarter. It sees cities as systems of systems.

Massachusetts voters go to the polls today to elect a replacement for the late U.S. Sen. Edward Kennedy, and the outcome could have serious implications for climate legislation.

This election will make or break the Democrats’ current 60-vote majority in the Senate, which is just enough right now to end a Republican filibuster. Much of the national discussion centers on the health care bill, which Republican candidate Scott Brown opposes. But a Republican victory also would likely mean defeat for cap-and-trade legislation this year.