climate change
DESCRIPTION
TRANSCRIPT
BY: NISHITA BANERJEEBY: NISHITA BANERJEE VI CVI C
WHAT IS CLIMATE?WHAT IS CLIMATE?
• Climate is the general weather Climate is the general weather conditions of a place.conditions of a place.
• It is the pattern of variation in It is the pattern of variation in temperature, humidity, temperature, humidity, atmospheric pressure, wind, atmospheric pressure, wind, precipitation etc.precipitation etc.
• Climate of the world is changing at a rapid speed.
• Changes in climate can be:
changes in average temperature
changes in rainfall patterns
changes in humidity level of a
place.
CHANGING CLIMATESCHANGING CLIMATESHAVE CHANGED LANDSCAPESHAVE CHANGED LANDSCAPES
ARAVALLI HILL FORESTS, INDIAARAVALLI HILL FORESTS, INDIA
CHANGES IN THECHANGES IN THE
FOLLOWING CAUSE FOLLOWING CAUSE
CLIMATE CHANGECLIMATE CHANGE:• Sun’s outputSun’s output• Earth’s orbitEarth’s orbit• Drifting continentsDrifting continents• Volcanic eruptionsVolcanic eruptions• Greenhouse gasesGreenhouse gases
SOLAR OUTPUT CAUSES SOLAR OUTPUT CAUSES ONLY MINOR CHANGES IN ONLY MINOR CHANGES IN EARTH’S TEMPERATURESEARTH’S TEMPERATURES..
•
In the distant past, these In the distant past, these made a big difference in made a big difference in climate over millions of climate over millions of
years by :years by :changing ice caps at the changing ice caps at the
polespoles altering ocean currents, altering ocean currents, which transport heat and which transport heat and
cold .cold .
CONTINENTAL DRIFTCONTINENTAL DRIFT
Huge volcanic eruptions can cool Earth Huge volcanic eruptions can cool Earth by injecting ash and tiny particles into by injecting ash and tiny particles into
the stratospherethe stratosphere
COOLING EFFECT AFTER COOLING EFFECT AFTER VOLCANIC ERUPTIONVOLCANIC ERUPTION
BUT THE MOST BUT THE MOST
SIGNIFICANT FACTOR FOR SIGNIFICANT FACTOR FOR CLIMATE CLIMATE
CHANGE ARECHANGE ARE
GREENHOUSE GASES ARE:
FACTORY SMOKEFACTORY SMOKE VEHICLE EXHAUSTVEHICLE EXHAUST
FOREST FIRESFOREST FIRES OIL REFINERIESOIL REFINERIES
GREENHOUSE GASES GREENHOUSE GASES CAUSECAUSE
GREENHOUSE EFFECTGREENHOUSE EFFECT
• Greenhouse gases like CO2 and H2O form a blanket above the earth surface.
• They trap the solar heat.
• This leads to warming of the atmosphere.
This leads to :• More drought • more flooding• less ice and snow• extreme weather • rising sea level
EXTREME WEATHER AND NATURAL CALAMITIES DUE TO GLOBAL WARMING
FLOODS DROUGHT
POLAR MELTDOWN SEVERE SNOWFALL
GLOBAL WARMING CAUSES MELTING GLACIERSGLOBAL WARMING CAUSES MELTING GLACIERS
AND RISING SEA LEVELSAND RISING SEA LEVELS
CYCLE
TO REDUCE YOURTO REDUCE YOURCARBON FOOTPRINTCARBON FOOTPRINT
BUT MAN’S GREED HAS ROBBED THE BUT MAN’S GREED HAS ROBBED THE MOTHER MOTHER EARTH OF ITS BEAUTY AND BOUNTY.EARTH OF ITS BEAUTY AND BOUNTY.
WE HAVE TO STOP THIS MAYHEM BEFORE WE HAVE TO STOP THIS MAYHEM BEFORE ITS TOO LATE.ITS TOO LATE.
- - MAHATMA GANDHI.MAHATMA GANDHI.