AFP: China has seized on its hosting of UN climate talks this week to showcase its efforts to curb carbon emissions, and environmentalists say the top greenhouse gas polluter is making huge progress. China’s phenomenal economic growth has made it the biggest source of greenhouse gases blamed for global warming, and those emissions will continue to soar due to its dependence on carbon-belching coal. But amid US-led pressure to do more, China has outlined an array of measures to curb …