What is an effect of an increase in greenhouse gases?

The effect of an increase in greenhouse gases primarily results in increased average global temperatures. Greenhouse gases, such as carbon dioxide, methane, and nitrous oxide, trap heat in the Earth's atmosphere, creating a greenhouse effect. This phenomenon leads to higher temperatures globally, causing a variety of environmental changes. These can include shifts in weather patterns, increased frequency and intensity of extreme weather events, and impacts on ecosystems and biodiversity.

While some might argue that greenhouse gases could enhance plant growth due to higher levels of carbon dioxide, this is often not a straightforward benefit, as various factors such as water availability and nutrient limitations also influence plant growth. Similarly, the strengthening of the ozone layer is unrelated to greenhouse gases; it is affected by different atmospheric chemicals. Finally, decreased atmospheric temperatures are contrary to the established effects of greenhouse gas emissions, which are known to contribute to warming rather than cooling. Therefore, increased average global temperatures is the most accurate representation of the effect of rising greenhouse gas concentrations.