Voice of America: President Bush says the United States will strive to stop the growth of greenhouse gas emissions by 2025. VOA’s Paula Wolfson reports the pledge came as representatives of 17 countries headed to Paris for talks on climate change. President Bush says the United States is already on a path to reduce the growth of greenhouse gases by 2012. He says it is time to set an even more ambitious target. “We have shown that we can slow emissions growth,” he said. “Today I am …