AAP: Australian farmers struggling to make a dollar from planting wheat or canola could soon try a new crop – carbon. Conservation groups are scouting out farmland to turn into forests, or “carbon factories”, to counter climate change. Up to 40 million hectares of land could be converted to forest under the Emissions Trading Scheme (ETS), due to start next year. Advocates say the scheme would provide a much-needed second income to farmers as well as absorb greenhouse gases, …