This global warming site contains questions commonly addressed to climate scientists and brief replies (based on the Intergovernmental Panel on Climate Change (IPCC) reports and other research). The questions concern the greenhouse effect and its impact on our climate, whether greenhouse gases are increasing and the climate warming, the relation of El Nino to global warming, change in the hydrological cycle (evaporation and precipitation) and atmospheric/oceanic circulation, climate becoming more variable and extreme, the importance of these changes in a longer-term context, the rise of sea levels, whether the observed changes can be explained by natural variability, and the future of global warming.