Climate describes typical weather conditions that prevail over extended periods in a region, while weather describes the hourly or daily conditions. Climate change is identified by long-term shifts in temperature, precipitation, winds and other indicators. The IPCC reported in 2007 that the climate is changing rapidly due to human activities like burning fossil fuels and deforestation being the primary factors. If aggressive action is not taken to reduce emissions, global temperatures could rise significantly by 2100 leading to major impacts.