The global warming controversy primarily concerns what percentage the 20th century increase in surface temperature is attributable to greenhouse gases and what steps, if any, society should take in response, and whether it is in a country’s economic interest to take action to reduce emissions of greenhouse gases.There is a strong consensus among scientists that most recent warming is caused by anthropogenic emissions of greenhouse gases and that warming will continue with serious consequences if emissions continue. A few scientists disagree, most commonly asserting that, although warming is occurring, its cause is either natural or human.