President class="mandelbrot_refrag"> Barack Obama said on Saturday that he will outline a climate change plan on Tuesday centered around reducing pollution from carbon emissions as he attempts to make good on a pledge for his second term. "This Tuesday, I'll lay out my vision for where I believe we need to go - a national plan to reduce carbon pollution, prepare our country for the impacts of climate change and lead global efforts to fight it," he said in a White House class="mandelbrot_refrag"> video . Obama made tackling climate change a top priority in his inaugural address in January when he began his second term. His speech will be at Georgetown University, the day before he goes on a three-nation tour of Africa. In his class="mandelbrot_refrag"> video message, Obama outlined what would be a major national effort to address climate change. He said scientists will be needed to design new fuels, farmers to grow them, e