Question

what is meant by global warming h​

Answer 1

here goes ur answer my dear friend.
the gradual increase in the temperature of earth is called global warming

Answer 2

Answer:

Global warming, the gradual heating of Earth's surface, oceans and atmosphere, is caused by human activity, primarily the burning of fossil fuels that pump carbon dioxide (CO2), methane and other greenhouse gases into the atmosphere. ... Already, global warming is having a measurable effect on the planet.