Question 1

Signs of global warming are more evident in the northern hemisphere than in the southern hemisphere.

Accepted Answer

This is because the northern hemisphere has a larger landmass and more industrial activity, which contributes to greenhouse gas emissions and the warming of the planet. Additionally, the Arctic is melting at a faster rate than the Antarctic, leading to changes in ocean currents and weather patterns in the northern hemisphere.

Question 2

Climate changes can influence the spread of number of diseases such as mosquito borne dengue and malaria,as well as the ones spread by waterborne bacteria and parasites.

Accepted Answer

Climate changes can alter the distribution and abundance of disease-transmitting organisms and increase the likelihood of disease transmission. Mosquito-borne diseases such as dengue and malaria are particularly sensitive to changes in temperature and rainfall, while waterborne diseases such as cholera can be influenced by changes in water temperature and quality. Therefore, climate change can have a significant impact on the spread of diseases.

Question 3

The limited resolution of global climate models makes it difficult to project small-scale,local climatic variations.

Accepted Answer

Global climate models have a limited resolution, which means they cannot accurately predict small-scale, local climatic variations. This limitation is due to the models' inability to capture the finer details of local topography, land use, and other factors that can affect the climate at a small scale. Hence, it is true that limited resolution of global climate models makes it difficult to project small-scale, local climatic variations.

Question 4

Concerns about greenhouse-effect heating relate not only to possible changes in temperature,but also to possible changes in precipitation patterns.

Accepted Answer

Greenhouse-effect heating can affect precipitation patterns, as it has the potential to shift global weather patterns and cause more extreme weather events such as droughts or floods.

Question 5

The changes in permafrost has very little effect on traditional lifestyles of local population,animal migrations,and ecosystems.

Accepted Answer

Permafrost plays a crucial role in the traditional lifestyles of local populations as it affects their ability to hunt, fish, and travel. Changes in permafrost also affect the migration patterns of animals and can cause disruptions in ecosystems.

Question 6

It is difficult to determine the effect of CO₂ on climate because the atmospheric concentration of methane,another "greenhouse gas" is so much greater.

Accepted Answer

COS (Carbonyl Sulfide) and methane are both greenhouse gases, but their atmospheric concentrations and impacts on climate are considered independently. Methane is indeed a potent greenhouse gas with a much higher concentration than COS, but the difficulty in determining COS's effect on climate is not due to methane's greater concentration. Instead, it's related to the complexity of COS's sources, sinks, and its lesser overall impact on climate compared to more abundant greenhouse gases like carbon dioxide and methane.

Question 7

The term "greenhouse effect" refers to an increase in atmospheric temperatures resulting from an increasing blanket of clouds around the earth.

Accepted Answer

The greenhouse effect refers to the trapping of heat in the earth's atmosphere by certain gases, such as carbon dioxide and methane. This results in an increase in atmospheric temperatures, not from clouds specifically.

Question 8

If all the polar ice sheets were to melt,world sea levels would rise only 1 to 2 meters.

Accepted Answer

This statement is false. If all the polar ice sheets were to melt, it is estimated that global sea levels could rise approximately 60 meters.

Question 9

Increased levels of carbon dioxide in earth's atmosphere will definitely result in increased crop yields.

Accepted Answer

While increased carbon dioxide can stimulate plant growth under certain conditions, it does not universally lead to increased crop yields due to factors like nutrient limitations, water availability, and the negative impacts of extreme weather events.

Question 10

Slowing the destruction of tropical rain forests may also slow the rise in atmospheric CO₂,because plants use carbon dioxide during photosynthesis.

Accepted Answer

This is true because if tropical rain forests are preserved, they can continue to absorb and use carbon dioxide through photosynthesis, which can help reduce the overall amount of carbon dioxide in the atmosphere.

Question 11

Global warming is not uniform throughout the earth as some places it is more severe than others.

Accepted Answer

Global warming is caused by various factors such as human activities and natural factors. As such, the effects are not uniform and some regions experience more severe consequences such as rising sea levels, heatwaves, droughts, and floods among others.

Question 12

Studies of cores from polar ice sheets indicate a correlation between greenhouse-gas concentrations and temperatures but do not indicate cause-and-effect.

Accepted Answer

While the correlation between greenhouse-gas concentrations and temperatures in ice core studies is well-established, these studies cannot prove cause-and-effect relationships between the two variables. Other types of evidence and analyses are necessary to establish causation.

Question 13

The plants and animals that will be most negatively impacted by global warming are those having ecosystems on or very near the equator.

Accepted Answer

Species near the equator are often adapted to stable climates, but those in polar regions or specific habitats like coral reefs may face more immediate threats due to rapid environmental changes.

Question 14

The principal source of rising levels of carbon dioxide in the atmosphere is the burning of fossil fuels.

Accepted Answer

The burning of fossil fuels releases carbon dioxide into the atmosphere, contributing to the increased levels of this greenhouse gas. Other sources include deforestation and certain industrial processes, but burning fossil fuels is the primary driver of rising carbon dioxide levels.

Question 15

Studies of past correlations between climate and atmospheric composition allow us now to project atmospheric warming very precisely as a function of CO₂ concentration.

Accepted Answer

While studies have shown a correlation between climate and atmospheric composition, projecting atmospheric warming as a precise function of CO₂ concentration is not currently possible. Climate is influenced by many complex factors, and while atmospheric composition is an important one, it is not the sole determinant of temperature changes.

Question 16

Water vapor is the most significant greenhouse gas in terms of average atmospheric concentration (2 to 3%),but its amount varies quickly over a matter of days,whereas the average level of carbon dioxide changes much more slowly.

Accepted Answer

This statement is true. Water vapor levels in the atmosphere can vary quickly due to changes in temperature and local weather patterns, while carbon dioxide levels have a much slower rate of change. However, despite its variability, water vapor is still the most significant greenhouse gas due to its high concentration.

Question 17

United Nations studies suggest that the impacts of global climate change are likely to be most severe in the highly industrialized countries.

Accepted Answer

United Nations studies suggest that the impacts of global climate change will be felt most acutely by developing countries, which are likely to experience more extreme weather events, rising sea levels, and food and water scarcity. Industrialized countries, on the other hand, are generally better equipped to adapt to these challenges and are responsible for a much larger share of global greenhouse gas emissions.

Question 18

El NinoSouthern Oscillation phenomena seem to be cyclic,recurring every four to seven years.

Accepted Answer

The El Nino-Southern Oscillation (ENSO) phenomenon is indeed cyclic and tends to recur every four to seven years. However, the intensity and duration of the cycle can vary, and sometimes ENSO events may not occur for several years in a row.

Question 19

The gas bubbles trapped in alpine glaciers preserve an excellent record of past atmospheric composition,which can be correlated with temperature.

Accepted Answer

The answer of The gas bubbles trapped in alpine glaciers...

Question 20

Global warming may increase the number of heat related deaths during summer.

Accepted Answer

As temperatures rise due to global warming, the risk of heat-related illnesses, such as heat stroke and dehydration, increases, which can lead to an increase in the number of heat-related deaths during summer.

Quiz 10: Climate-Past, present, and Future