Is global warming a threat to life? Where's the evidence of this?

Answer 1

Err you want proof?
The Continent of Africa is turning slowly but surely into a vast uninhabitable desert.
Not fun for the animals let alone the people!

Something to think about next time you use your energy wasting tumble-driers! That's why there's Wind & Sun, not because hanging your washing out MAKES YOU POOR!
Only an American could come up with a Crook o S**T like that!

Answer 2

for centurion etc if you get off your *** and read more about the rest of the world you would see Global Warming is a threat.
The weather in countries around the world is getting worse every year.
Just in America Hurricanes and tornadoes are natures way of trying to cool the planet. Why do you think we are having more bigger and stronger hurricanes every year.
Why do you think other countries which NEVER had hurricanes, torrential rain, droughts etc are suddenly having these phenomenon.

Big problems the more it heats up the more ice caps and glaciers melt, the more fresh water gets into the sea, dissolving the salt water which then evaporates at a different temperature, causing more water in the atmosphere.
BUT the more the salt water becomes fresh water the less effective are things like the gulf stream, Britain could have temperatures like Moscow in 20-30 years from now. New York will be a big Ice cube.
Just watch the weather around the world

Answer 3

I don't know if this is evidence, but in 1975 spring time was cool in the morning about 64 and at the height of the day it was 75 and in south LA. we no longer have that, trees brought leaves in the spring, now they bring in new leaves in the winter, it's also hotter now than then yesterday it was 99, not even summer yet so I think it is a treat to life as we know it, that's not to say its killing everything

Answer 4

Sure its a serious problem. The drastic changes in our climate are probably the best examples or symptoms of global warming. This problem is gonna get worse year after year.

Answer 5

on the long term scale...yes global warming is very jeopridizing to life on earth.It causes climatic shiftsand a rise in the oceans water level which will flood coastal regions

Answer 6

Global warming is a crock! It's all junk science by the "sky is falling" crowd of liberals.

Answer 7

According to the National Academy of Sciences, the Earth's surface temperature has risen by about 1 degree Fahrenheit in the past century, with accelerated warming during the past two decades. There is new and stronger evidence that most of the warming over the last 50 years is attributable to human activities. Human activities have altered the chemical composition of the atmosphere through the buildup of greenhouse gases – primarily carbon dioxide, methane, and nitrous oxide. The heat-trapping property of these gases is undisputed although uncertainties exist about exactly how earth’s climate responds to them. Go to the Emissions section for much more on greenhouse gases.
Our Changing Atmosphere

Energy from the sun drives the earth’s weather and climate, and heats the earth’s surface; in turn, the earth radiates energy back into space. Atmospheric greenhouse gases (water vapor, carbon dioxide, and other gases) trap some of the outgoing energy, retaining heat somewhat like the glass panels of a greenhouse.
Without this natural “greenhouse effect,” temperatures would be much lower than they are now, and life as known today would not be possible. Instead, thanks to greenhouse gases, the earth’s average temperature is a more hospitable 60°F. However, problems may arise when the atmospheric concentration of greenhouse gases increases.

Since the beginning of the industrial revolution, atmospheric concentrations of carbon dioxide have increased nearly 30%, methane concentrations have more than doubled, and nitrous oxide concentrations have risen by about 15%. These increases have enhanced the heat-trapping capability of the earth’s atmosphere. Sulfate aerosols, a common air pollutant, cool the atmosphere by reflecting light back into space; however, sulfates are short-lived in the atmosphere and vary regionally.

Why are greenhouse gas concentrations increasing? Scientists generally believe that the combustion of fossil fuels and other human activities are the primary reason for the increased concentration of carbon dioxide. Plant respiration and the decomposition of organic matter release more than 10 times the CO2 released by human activities; but these releases have generally been in balance during the centuries leading up to the industrial revolution with carbon dioxide absorbed by terrestrial vegetation and the oceans.

What has changed in the last few hundred years is the additional release of carbon dioxide by human activities. Fossil fuels burned to run cars and trucks, heat homes and businesses, and power factories are responsible for about 98% of U.S. carbon dioxide emissions, 24% of methane emissions, and 18% of nitrous oxide emissions. Increased agriculture, deforestation, landfills, industrial production, and mining also contribute a significant share of emissions. In 1997, the United States emitted about one-fifth of total global greenhouse gases.

Estimating future emissions is difficult, because it depends on demographic, economic, technological, policy, and institutional developments. Several emissions scenarios have been developed based on differing projections of these underlying factors. For example, by 2100, in the absence of emissions control policies, carbon dioxide concentrations are projected to be 30-150% higher than today’s levels.

Changing Climate

Global mean surface temperatures have increased 0.5-1.0°F since the late 19th century. The 20th century's 10 warmest years all occurred in the last 15 years of the century. Of these, 1998 was the warmest year on record. The snow cover in the Northern Hemisphere and floating ice in the Arctic Ocean have decreased. Globally, sea level has risen 4-8 inches over the past century. Worldwide precipitation over land has increased by about one percent. The frequency of extreme rainfall events has increased throughout much of the United States.
Increasing concentrations of greenhouse gases are likely to accelerate the rate of climate change. Scientists expect that the average global surface temperature could rise 1-4.5°F (0.6-2.5°C) in the next fifty years, and 2.2-10°F (1.4-5.8°C) in the next century, with significant regional variation. Evaporation will increase as the climate warms, which will increase average global precipitation. Soil moisture is likely to decline in many regions, and intense rainstorms are likely to become more frequent. Sea level is likely to rise two feet along most of the U.S. coast.

Calculations of climate change for specific areas are much less reliable than global ones, and it is unclear whether regional climate will become more variable.

Answer 8

I think it have to do with unseasonal weather reports from around the world!
Pollution's reports. Escalating; of some illnesses as heart diseases, asthma, cancer etc.
From deserts sands encroaching on green lands...

Answer 9

There isnt any real evidence as Gore would like you to think.

Answer 10

HI,
GLOBAL WARMING IS DEVELOPING
VERY SLOWLY. THERE IS NO POINT
FOR FEAR FOR US NOW. IT IS THE WORRY OF COMING GENERATIONS.