Why do warmer and wetter biomes have better net primary productivity?

Warmer and wetter biomes have better net primary productivity because warm temperatures increase the rate of photosynthesis in plants, allowing them to grow faster and produce more biomass. Additionally, higher moisture levels ensure that plants have access to an adequate water supply, which is essential for their growth and metabolism. These conditions help to support a greater abundance and diversity of plant species, leading to higher overall productivity in these biomes.