Green Plumbing

Answer: D - All of the three preceding responses are responsible for substantially affecting the success of agricultural crops in the US. The effects of greenhouse gases (primarily CO₂) and increased temperatures can aid the success and yield of some crops, but overall, their impacts are more deleterious than helpful. Droughts and flooding are both affected by temperature and can destroy or greatly harm crops; warmer temperatures can create ideal environments for crop-damaging weeds and insects.