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The Global Warming of The 20-21st Century 大图 -…
The Global Warming of The 20-21st Century 
Human Factors
Human population growth is a major contributor to global warming, given that humans use fossil fuels to power their increasingly mechanized lifestyles.
More people means more demand for oil, gas, coal and other fuels mined or drilled from below the Earth’s surface that, when burned, spew enough carbon dioxide (CO2) into the atmosphere to trap warm air inside like a greenhouse.
With worldwide population expected to surpass nine billion over the next 50 years, environmentalists and others are worried about the ability of the planet to withstand the added load of greenhouse gases entering the atmosphere and wreaking havoc on ecosystems down below.
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Emissions of too much carbon dioxide (CO2) and other heat-trapping gases into the atmosphere when we burn fossil fuels to generate electricity, drive our cars, and power our lives.
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The principal cause of acid rain is sulfur and nitrogen compounds from human sources.
Both acid deposition and changes in the global atmosphere and climate affect terrestrial and aquatic ecosystems.
Acid rain damages the waxy layer on the leaves of trees. This makes it more difficult for trees to absorb the minerals they need for healthy growth and they may die. Acid rain also makes rivers and lakes too acidic for some aquatic life to survive.
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Natural Factors
It release the greenhouse gas carbon dioxide, contributing to warming of the atmosphere.
Volcanic eruptions have had very little influence on the temperature changes we’ve seen in the last century, except for the brief period following an eruption.
Along with other natural variability, such as ocean cycles and changes in the sun’s activity, volcanic eruptions contribute to ups in global temperature from year to year.
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Blast a cloud of ash, dust and sulphur dioxide into the stratosphere, which is quickly blown around the globe.
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The effects usually occur in cycles, and primarily include how Earth's obliquity, the eccentricity of Earth's orbit, and the precession of the equinoxes and solstices affect Earth's climate.
There are many things which influence Earth's climate. Among these many things, are various solar effects. Earth's climate is affected by a number of factors dealing with the Earth as a whole, in relation to its position in the space relative to the sun. These factors include the angle of Earth's axial tilt, the eccentricity of Earth's orbit , and Earth's position in time in the precession of the solstices and equinoxes .
The major ice ages of the Pleistocene Epoch were closely related to the influence of these variations on summer insolation at high northern latitudes. Orbital variations thus exerted a primary control on the extent of continental ice sheets.
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However, Earth’s orbital changes are generally believed to have had little impact on climate over the past few millennia, and so they are not considered to be significant factors in present-day climate variability.
There's a more than 95 percent probability that human activities over the past 50 years have warmed our planet.
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