Reuters: South Africa expects to put in place a binding climate change policy within three years to cap emissions by 2020-25, the environment minister said at the launch of a climate summit on Tuesday. Minister of Environmental Affairs and Tourism Marthinus van Schalkwyk said lack of action could lead emissions in South Africa, the continent’s largest emitter, to quadruple by 2050. “If we continue to grow without a carbon constraint, we face the threat of border tax adjustments or trade …