Water vapor is the largest contributor to greenhouse gases at 36-70%. Carbon dioxide is second with 9-26%, then methane with 4-9%, and finally ozone with 3-7%.

The greenhouse effect can also be found on Mars, Venus, and Saturn's largest moon, Titan. The effect on Venus is large because of its dense atmosphere of made of carbon dioxide.

The problems of invasive species occurs most often due to human activity, not due to a shifting global temperature average. Acidification of oceans are directly related to  levels in the atmosphere and therefore global warming. Global warming can also indirectly bring about the loss of habitats due to shifting precipitation levels and temperature averages within regions.

According to NASA, there have been 7 warming and cooling cycles in the past 650,000 years. The reason this cycle has so much publicity is due to the rapid increase of temperature during on overall cool period. The fact that the rate of warming is significantly faster, correlating with human development, is the reason so many scientists are concerned about global warming.

All of these are likely effects of continued global warming. Diminishing food and water supplies is also an important outcome to consider - this especially could lead to immigration issues regarding environmental refugees and other international crises.

CFCs are classically known to be extremely degrading to the ozone layer, so much so that CFCs were banned by the united states in the 1970s in hopes of curbing the expanding of the hole in the ozone layer. CFC's are also very prolific in the stratosphere, which is where the ozone layer resides.

Although  is still technically a greenhouse gas, it is not currently controlled under the Kyoto Protocol due to its inherent nature of being predominately produced naturally. Another reason for this is that water vapor is difficult to track, as it is typically a non-point source of greenhouse gas. Most non-point sources of pollution or waste are normally not controlled under environmental law at this time.

Al Gore is passionate about climate change and aims to educate citizens about the cause. In 2006, he helped create a documentary, An Inconvenient Truth, which has been credited for raising public awareness. This documentary has also been included in some school's curriculums. 

A biome is a large geographical area that consists of flora and fauna that have adapted to local conditions. The tundra is a geographical region that consists of arctic-adapted plants and animals. The other answers are more examples of ecosystems, specific communities of plants and animals adapted to certain conditions within a biome. Other examples of biomes include (but are not limited to) desert, deciduous forest, savanna and taiga (subarctic forest).

The correct answer is "temperate deciduous forest." Temperate deciduous forests typically get more precipitation than taiga, shrubland, desert, or grassland, and their flora is dominated by broadleaf trees.