In the Last Century, Human Activities Have Caused Dramatic Increases

Q39: _ has been responsible for around 50%

Q40: The Earth's average climate is determined by

Q41: Plate tectonics has no effect on climate

Q42: The last glacial maximum ended _ years

Q43: Without this, the Earth would warm up

Q45: The mesosphere contains the ozone layer.

Q46: At this point in time global mean

Q47: Albedo is the percentage of radiation reflected

Q48: The _ is an international panel of

Q49: An increase in greenhouse gas concentrations corresponds