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.