While the other subcomponents are also part of the physical environment, their physical, biological or chemical characteristics can be influenced in the short to mid-term by human activities. Statistics on these general physical conditions are important, as they help determine the scope of and influences on the environmental resources of a country. Without information on these baseline conditions, it is difficult for governments to judge the need for and efficacy of policies. This topic covers data on atmospheric, climatic and weather conditions across territories and over time.