which is an effect of global warming?

a. Increasing carbon dioxide in the atmosphere.
b. Increasing greenhouse gas concentration in air.
c. Rising sea level over a period of time.
d. Changing seasons every year.

All of the options listed are effects of global warming.

The effects of global warming include:

a. Increasing carbon dioxide in the atmosphere: Increased levels of carbon dioxide are one of the main causes of global warming. Carbon dioxide traps heat in the atmosphere, leading to the greenhouse effect and contributing to the Earth's warming.

b. Increasing greenhouse gas concentration in the air: Greenhouse gases such as carbon dioxide, methane, nitrous oxide, and others trap heat in the Earth's atmosphere, causing the planet to warm. The increased concentration of these gases due to human activities is a significant factor in global warming.

c. Rising sea levels over a period of time: As global temperatures rise, ice sheets and glaciers melt, causing a subsequent rise in sea levels. This melting also contributes to the increased volume of water in the oceans, leading to coastal erosion, flooding, and submergence of low-lying areas.

d. Changing seasons every year: While global warming can impact weather patterns and climate, it does not directly cause changing seasons every year. The changing of seasons is a natural occurrence caused by the Earth's tilt on its axis as it revolves around the sun. However, climate change resulting from global warming can influence the timing and intensity of seasons, leading to alterations in rainfall patterns, temperature ranges, and growing seasons.

In summary, the effects of global warming include increasing carbon dioxide levels, rising greenhouse gas concentrations, rising sea levels over time, and potential alterations in weather patterns and climate.

The correct answer is c. Rising sea level over a period of time.

Global warming refers to the long-term increase in the average temperature of the Earth's atmosphere and oceans. It is primarily caused by the increase in greenhouse gases, such as carbon dioxide, in the atmosphere. Here's how you can determine the effect of global warming:

a. Increasing carbon dioxide in the atmosphere: This is one of the main causes of global warming, rather than an effect. The burning of fossil fuels, industrial processes, and deforestation contribute to the increased levels of carbon dioxide in the atmosphere.

b. Increasing greenhouse gas concentration in air: This is also a cause, rather than an effect. Greenhouse gases trap heat in the atmosphere, leading to global warming. Besides carbon dioxide, other significant greenhouse gases include methane, nitrous oxide, and ozone.

c. Rising sea level over a period of time: This is indeed an effect of global warming. As the Earth's temperatures rise, glaciers and ice sheets start to melt. The resulting water increases the volume in the oceans, causing sea levels to rise. This can lead to coastal flooding, erosion, and displacement of communities living in low-lying areas.

d. Changing seasons every year: While climate change can alter weather patterns and lead to some variations in seasons, the changing seasons are not solely caused by global warming. Seasonal changes are a natural occurrence as a result of the Earth's axial tilt and its orbit around the sun.

So, in summary, the effect of global warming among the given options is the rising sea level over time.