Which measurement check the ecological issue of global warming that the world is currently facing?
carbon footprint
nitrogen footprint
hydrocarbon footprint

During convection, less dense fluid rises and denser fluid sinks.

Land conservation is a worldwide priority. there are several methods to prevent the loss of land due to a variety of reasons. which method is not a way to conserve land? a) sea walls b) rainwater harvesting c) limits on clear cuts of forests d) cut and burn methods of clearing land

Methane gas created by a cows flatulence especially in a large herd is a greenhouse gas. true or false.