Guardian: As the climate heats up, so does the debate on what to do about forests. China, facing regional environmental challenges, such as dust storms and wood shortages is investing in large-scale reforestation. A huge swath of the country is covered with trees planted in recent decades to attempt to stabilise the land and provide resources. It is described as a “green wall”, and China claims that the CO2 from the atmosphere as the trees grow is providing a global climate benefit, offsetting some …