In this article by The Economist (source available below), it is described how climate change will affect more than the weather.

Scientists estimate that by the end of the century, three degrees of global warming would cost the median American county 4% of its GDP.

The reason being is that predicted weather patterns would impact agricultural yields, energy usage and other economic variables.

While many assumptions were made in the forecasting model, the need to improve weather forecasts by performing scientific research is real.