which is an effect of global warming

changing seasons every year
increasing carbon dioxide in the atmosphere
increasing greenhouse gas concentration in the air
rising sea level over a period of time

All of the options mentioned are effects of global warming. They include changing seasons every year, increasing carbon dioxide in the atmosphere, increasing greenhouse gas concentration in the air, and rising sea levels over a period of time.

One effect of global warming is rising sea levels over a period of time. This occurs due to the melting of polar ice caps and glaciers, which leads to an increase in the volume of water in the oceans. As a result, coastal areas become more prone to flooding and erosion, and low-lying islands and coastal communities are at risk of being submerged.

One effect of global warming is rising sea levels over a period of time. This is caused by the melting of ice in glaciers and ice caps, as well as the expansion of water as it warms up. To understand why rising sea levels occur as a result of global warming, you need to comprehend the concept of the greenhouse effect.

The greenhouse effect is the process by which certain gases in the Earth's atmosphere, known as greenhouse gases, trap heat from the sun and prevent it from escaping back into space. Carbon dioxide (CO2) is one of the primary greenhouse gases. Human activities, such as burning fossil fuels (like coal, oil, and natural gas) and deforestation, contribute to the increases in CO2 levels.

In turn, these increased levels of greenhouse gases enhance the greenhouse effect, leading to a rise in global temperatures. As the Earth's temperature increases, it causes the polar ice caps and glaciers to melt, adding more water to the oceans. Additionally, as water warms, it expands due to thermal expansion, further contributing to rising sea levels.

To study the effect of global warming on rising sea levels, researchers use various methods such as satellite measurements, tide gauges, and observations from buoys. These tools allow scientists to track changes and provide accurate measurements of sea level rise over time.

It is worth mentioning that global warming also has other effects, which you mentioned in your question: changing seasons every year, increasing carbon dioxide in the atmosphere, and increasing greenhouse gas concentrations in the air. Each of these impacts is interconnected and contributes to the overall issue of global warming and its subsequent effects.