Environmentalist: The rise in the global temperature has many causes.

Environmentalist: The rise in the global temperature has many causes. One contributing factor is the increase of carbon dioxide which directly or indirectly causes the level of greenhouse gases — the primary contributor to global warming — to rise in the atmosphere. Due to huge urbanization and modernization, there has been a massive decrease in forest land. This has, in turn, resulted in lower quantities of carbon dioxide getting converted into oxygen. It is also possible that the increase in ocean-atmosphere exchange has had an impact on the level of carbon dioxide: during such exchange, carbon dioxide is released from the ocean into the air at the sea surface.

Indicate in the table which immediate cause-and-effect sequence would most likely, according to the environmentalist, result in rise in the global temperature. Make only two selections, one in each column.

Cause	Effect
		An increase in ocean-atmosphere exchange
		A decrease in forest land
		An increase in global temperature
		An increase in greenhouse gases
		A decrease in quantities of carbon dioxide getting converted into oxygen