I agree but large swaths of forest are a good thing. In most cases trees are a crop. If we want more of them, then the farmer needs to be able to sell them to s

I agree but large swaths of forest are a good thing. In most cases trees are a crop. If we want more of them, then the farmer needs to be able to sell them to someone. By increasing the usage of tree products, we increase the number of trees in existence at any point in time (because the farmer converts some land from a different crop to trees to meet market demand). Also, efficiency isn't everything. If you make something more efficient, then often the saving is passed on to the customer. The customer then spends the money they saved on something else that will have some environmental impact. Or worse, the classic example is plane flight. The industry got a lot more efficient. As a result people can afford to fly a lot more. The environmental impact went up hugely. (Thinking about this now, the efficiency of plastic bags is what made people use so many of them).