The greenhouse effect

11 important questions on The greenhouse effect

How does our atmosphere work?

Our atmosphere is a layer of air around the surface of the Earth. The amosphere is composed of a mixure of gases. Some sunlight passes through the atmosphere, the rest is reflected. Part of the sunlight that reaches the Earth's surface is converted into heat.  This heat is reflected as well.

What does it mean that not all the heat can pass back out through the gases in the atmosphere?

A lrge part of this heat radiation from the Earth cannot escape and is trapped within the atmosphere; this keeps the earth warm.

So what is the greenhouse effect?

The atmospheric gases act like a greenhouse. Sunlight can pass throught the glass of  greenhouse, but th eheat cannot escape enymore and is trapped inside the greenhouse.
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How much lower would the temperature be without greenhouse gases?

30 degrees lower

How can human activities have contributed to global warming?

the release of greenhouse gases into the air. The gaes in the atmosphere therefore trap more heat radiation and the temperature rises.  Human ativities have lead to an increaes of burning of fossil fuels -> carbon dioxide is released. This increase in carbon dioxide causes an enhacned greenhouse effet.

What does increasing temperatures result in?

rising sea levels.

What are the rising sea levels?

When water becoes warmer it expands and needs more space. Rising sea levels are also sue to partial metling of Antartic ice caps and  glciers. THis menas that low lying areas can become flooded

Where may higher temperatures also lead to?

persistent drought in some areas. nd drought may result in a permanent shift to desert conditions. Large areaas are threatened by desert expension.  Sahara is expanding 20km2 every day.

What are the positive and what are negative effects for temperature increase for crops according to scientists?

-  - severe drought threatens crop production and thus food supply
+ - the growing season will be longer and a longer growing season means higher yields. Perhaps areas that wer epreviously to cold to grow crops will now be warm enough.

How ar the impacts of climate change significant on nature?

Many plant and animal species have become endangered, while others are expanding their habitat northwards into areas preciously too cold for survival.

How do the life cycles of many species change?

because winters become milder and springs become warmer.  Rsising emperatures cause plants to bloom and trees to get their leaves earlier in spring. Earlier leaves and flowers can have serious problems  for some food chains.

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