Final answer:
The Keeling Curve measures CO₂ at a remote location and proves rising levels due to human activities. Without the greenhouse effect, Earth's average temperature would be below freezing. The main new source of CO₂ is fossil fuels, contributing to climate change. Enhanced plant growth doesn't permanently absorb excess CO₂.
Step-by-step explanation:
Understanding the Greenhouse Effect and Atmospheric CO₂
The ideal location of Keeling's carbon dioxide detectors was Mauna Loa Observatory in Hawaii, chosen for its remote location, far from significant vegetation and urban sources of CO₂, allowing for accurate background measurements of the gas. Over the course of a year, carbon dioxide levels rise and fall due to seasonal changes in plant growth and decay, with higher levels in winter and lower in summer. The "Keeling Curve" has shown a continuous increase in atmospheric CO₂, proving that human activities, such as burning fossil fuels, are contributing to the rise in greenhouse gases.
Without the greenhouse effect, the average temperature of Earth would be substantially colder, likely below freezing, as greenhouse gases trap heat and warm the planet. The new source of carbon dioxide in our atmosphere is the burning of fossil fuels, such as coal, oil, and natural gas, for energy production. As humans continue to burn fossil fuels, global temperatures are expected to rise, leading to climate change.
On Venus, the high concentration of CO₂ leads to extremely high temperatures due to its potent greenhouse effect. Conversely, Mars's low CO₂ concentrations contribute to colder temperatures. Infrared radiation is another term for heat radiation. Carbon dioxide can stay in the atmosphere for decades to centuries before it's absorbed by the oceans, typically averaging around a century.
Ice core studies have shown that Earth had lower atmospheric CO₂ levels in the past, in contrast to the current rising trend. Coal and oil producers might be alarmed by the use of fossil fuels changing the climate because it threatens the long-term viability of their industries and may lead to new regulations or a shift away from fossil fuel dependency. The use of fossil fuels has been beneficial to humankind by powering industrial growth and innovation, but it now poses significant challenges due to climate change.
In the next 50 years, carbon dioxide levels may grow significantly, potentially doubling pre-industrial revolution levels. According to the last film clip, enhanced plant growth in forests caused by additional CO₂ will not permanently absorb the excess carbon dioxide, as the carbon cycle is a dynamic process and other factors can release stored CO₂ back into the atmosphere.