Question

The current level of atmospheric __________ recently surpassed 400 parts per million.

a) Methane
b) Nitrous oxide
c) Carbon dioxide
d) Ozone

Answer 1

The atmospheric gas that recently surpassed 400 parts per million is carbon dioxide, primarily due to deforestation and the burning of fossil fuels. The correct answer is option: c) Carbon dioxide.

Step-by-step explanation:

• The current level of atmospheric carbon dioxide recently surpassed 400 parts per million. This milestone is significant as it represents a stark increase from the pre-industrial level of approximately 280 parts per million.
• The primary causes for this unprecedented rise are activities such as deforestation and the burning of fossil fuels like coal, oil, and natural gas.
• These practices have led to an increase in greenhouse gas concentrations, contributing to global warming and climate change.
• This alteration of our atmosphere raises concerns about its long-term impact on global temperatures, weather patterns, and the sustainability of various ecosystems.