问答题 Climate change resulting from CO₂ and other greenhouse gas emission poses a huge threat to human welfare. To contain that threat, the world needs to cut emissions by about 50% by 2050, and to start cutting emissions now. A fair global deal will require the UK to cut emissions by at least 80% below 1990 levels by 2050. The good news is that reductions of that size are possible without sacrificing the benefits of economic growth and rising prosperity. Technologies are available or with appropriate support could be developed which deliver low-carbon energy; opportunities to increase the efficiency with which we use energy are huge; lifestyle changes which will not undermine welfare can produce significant cuts in energy consumption. The challenge is not the technical feasibility of a low-carbon economy but making it happen. Ensuring action will require strong leadership from government and a concerted response from individuals and businesses.无