Environmental Science Simple Test

Explanation
The greenhouse effect is primarily caused by the accumulation of greenhouse gases in the atmosphere, such as carbon dioxide and methane, which trap heat from the sun and result in global warming. While vehicles, pollution, and waste contribute to greenhouse gas emissions, fruits do not have a direct impact on the greenhouse effect. Therefore, fruits are not a common cause for the greenhouse effect.

Explanation
In 1997, the United Nations conference on climate in Kyoto, Japan issued an agreement on global warming. This agreement aimed to address the issue of climate change and set targets for reducing greenhouse gas emissions. It was a significant milestone in international efforts to combat global warming and marked a crucial step towards global cooperation on climate action.

Explanation
Global warming is the correct answer because it refers to the long-term increase in Earth's average temperature due to human activities, such as the burning of fossil fuels and deforestation. This increase in temperature can lead to various health problems for humans, including heat-related illnesses, respiratory issues from air pollution, the spread of infectious diseases, and the disruption of ecosystems that provide essential resources for human health.

Explanation
Ultraviolet radiation is the main reason for the depletion of the ozone hole. Ozone depletion occurs when certain chemicals, such as chlorofluorocarbons (CFCs), are released into the atmosphere. These chemicals break down ozone molecules in the stratosphere when exposed to ultraviolet radiation from the sun. This leads to the formation of the ozone hole, which allows more harmful UV radiation to reach the Earth's surface, posing risks to human health and the environment.

Explanation
The correct answer is 0.0387. This indicates that Earth's global average concentration was 0.0387 percent.