12.2. Global Warming (Climate Change) Implications

Observations show that global temperatures have risen by about 0.6 °C over the 20th century. There is strong evidence now that most of the observed warming over the last 50 years is caused by human activities. Climate models predict that the global temperature will rise by about 6 °C by the year 2100.

This chunk highlights the increase in average global temperatures over time. It points out that global temperatures rose by 0.6 degrees Celsius during the 20th century, which suggests that the Earth is warming up. Notably, most of this warming is attributed to human activities, such as burning fossil fuels and deforestation, which increase greenhouse gas levels in the atmosphere. Furthermore, climate models predict even more significant warming in the future, estimating an increase of approximately 6 degrees Celsius by the year 2100 if current trends continue.

Consider cooking a pot of water on a stove. At first, the water starts at room temperature. If you keep adding heat, eventually the water will begin to boil. Similarly, our planet is like that pot of water. Small increases in temperature lead to larger effects, and if we keep adding heat through human activities, the consequences for the planet will be much more severe.

In general, the faster the climate change, the greater will be the risk of damage. The mean sea level is expected to rise 9 - 88 cm by the year 2100, causing flooding of low lying areas and other damages.

This chunk discusses the expected rise in sea levels due to climate change. As global temperatures increase, polar ice caps and glaciers are melting, contributing to rising sea levels. The prediction is that mean sea level could rise between 9 to 88 centimeters by the year 2100. A faster rate of climate change corresponds to increased risks, which may lead to the flooding of coastal areas and significant impact on communities and ecosystems dependent on these regions.

Imagine living in a house by the beach. Over time, due to continuous waves and storms, the beach sand loses its shape, and the water starts creeping closer to your house. In a similar way, as sea levels rise, areas that are currently dry land can become underwater, impacting homes and livelihoods for people living on the coast.

Water resources will be affected as precipitation and evaporation patterns change around the world. This will affect agricultural output. Food security is likely to be threatened and some regions are likely to experience food shortages and hunger.

This chunk talks about how climate change can disrupt rainfall patterns and water availability, leading to challenges in agriculture. Changes in precipitation and increased evaporation can reduce the water supply for crops. This reduction can threaten food security, especially in regions that already face agricultural difficulties. Such impacts may result in food shortages and increased hunger, particularly in vulnerable populations.

Consider a garden that depends on regular watering from rain. If you suddenly have unpredictable weather—too much rain one week and then a drought—some plants may thrive while others could die. This inconsistency mirrors how climate change affects farming globally, potentially leading to insufficient food supplies.

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