Global warming

 Todays scenarios

Global Warming is defined as the increase of the average temperature on 

Earth. As the Earth is getting hotter, disasters like hurricanes, droughts and 

floods are getting more frequent. 

Over the last 100 years, the average temperature of the air near the Earth´s 

surface has risen a little less than 1° Celsius (0.74 ± 0.18°C, or 1.3 ± 0.32° 

Fahrenheit). 

It is responsible for the conspicuous increase in storms, floods and raging 

forest fires we have seen in the last ten years, though, say scientists. 

Earth should be in cool-down-period

But it is not only about how much the Earth is warming, it is also about how 

fast it is warming. There have always been natural climate changes – Ice Ages and the 

warm intermediate times between them – but those evolved over periods of 50,000 to 

100,000 years. 

A temperature rise as fast as the one we have seen over the last 30 years has 

never happened before, as far as scientists can ascertain. Moreover, normally the 

Earth should now be in a cool-down-period, according to natural effects like solar 

cycles and volcano activity, not in a heating-up phase.

The Most Important Things You Can Do about Rapid Climate Change:

1. Understand the Problem

2. Do Something Today to Reduce Greenhouse Gas Emissions

The hard fact is that despite what many nations, companies, cities and people

are starting to do to reduce their global warming emissions, the world is putting more

CO2 into the air than ever before. The current amount is 385 parts per million (ppm) --

higher than ever in the past 800,000 years.

At the same time, renowned American climatologist Dr. James Hansen of

NASA says we already have too much CO2 and other greenhouse gases in the air: "If

humanity wishes to preserve a planet similar to that on which civilization developed

and to which life on Earth is adapted CO2 will need to be reduced from its current 385

ppm to at most 350 ppm."

What Is the Greenhouse Effect?

Global warming is perhaps the most important environmental problem in the world

today. Levels of greenhouse gases are increasing in the atmosphere due to human

activities, and are changing the composition of the atmosphere and global warming.

Climate scientists agree that human activities such as the burning of fossil fuels

contribute to the problem.

Events that foreshadow the types of impacts likely to become more frequent and

widespread with continued warming.

Spreading disease

Earlier spring arrival

Plant and animal range shifts and population changes

Coral reef bleaching

Downpours, heavy snowfalls, and flooding

Droughts and fires

1.Impact of climate change on agriculture

Shortage in grain production

Poverty impacts

Temperature potential effect on growing period

Potential effect of atmospheric carbon dioxide on yield

Effect on quality

Agricultural surfaces and climate changes

Erosion and fertility

Potential effects of global climate change on pests, diseases and weeds

Glacier retreat and disappearance

Ozone and UV-B

ENSO effects on agriculture

2.Impact of agriculture on climate change

Land use