Climate change is the current rapid warming of the Earth's climate caused by human activity. If left unchecked (and current responses are doing little to halt it) it poses an unprecedented threat to human civilisation and the ecosystems on this planet. Discover the causes and effects of climate change, but also solutions to reduce it. Find out how you can take action to save the environment. Find out how you can take action to save the environment.

1. Welcome to Our Presentation
on
“Climate Change”
Presented by: Minhazul Wahid Shaown
ID No- 191810034, EEE
Welcome to My Presentation
on
“Climate Change”

2. CONTENT
● What is Climate Change
● Causes of Climate Change
● Consequences of Climate Change
● Prevention of Climate Change

3. • Definition of Climate & Climate Change
Climate :
Climate is the average weather
conditions over time.
Climate Change :
Climate Change is a change in the
pattern of weather, and related changes
in oceans, land surfaces and ice sheets,
occurring over time scales of decades or
longer.

4. ● Causes of Climate Change
The main cause of Climate Change is
Global Warming.Global Warming is
caused by the Greenhouse Effect.
Thermal image of earth from 1970-2015

5. Greenhouse Effect is a natural process by
which the atmosphere retains some of the
sun’s heat, allowing the Earth to maintain
the necessary conditions to host life.
Gases that trap heat in the atmosphere are
called GHG.
Main Green House gases are -
● CO2 (Carbon Dioxide)
● CH4 (Methane)
● N2O (Nitrous Oxide)
● CFC,SF6,NF3 (Fluorinated Gases) etc.
● Causes behind Global
Warming:
# Green House Effect :
But daily human activities maximize the
Greenhouse Effect,causing the planet’s
temperature to increase .

6. Forests are natural carbon
sinks, absorbing CO2 through
photosynthesis and returning
oxygen to the atmosphere.So
when they are cut down, that
beneficial effect is lost and the
carbon stored in the trees is
released into the atmosphere,
adding to the Greenhouse
Effect.

7. # Destruction of Marine Ecosystems:
The oceans are also carbon sinks,
absorbing up to 50 % of CO2.The problem
is that, when they reach their limit,they
can’t absorb more CO2 & as a result the
ocean acidifies and causes death and
disease among marine flora and fauna.

8. # Burning of Fossil Fuel for Energy :
Fossil fuels are fuels created from organic
materials. Fossil fuels include oil, natural gas
and coal. When these fossil fuels are
burned, they release carbon dioxide,
methane, nitrogen and particulates into the
atmosphere. These upset the natural
balance of nitrogen and carbon dioxide in
the atmosphere, which leads to smog, acid
rain and Greenhouse Effect.

9. # Increase of Population :
An increasingly numerous
population needs more and
more resources, which
speeds up the increase in
greenhouse gas emissions.

10. ● Consequences of Climate Change
# Effects on Species &
Change in Eco-system :
Every species worldwide is impacted by
Climate Change. By 2100, an estimated 50%
of all the world’s species could go extinct
because of Climate Change.
If nations fail to rein in their greenhouse gas
emissions, nearly every Ecosystem on the
Planet will be transformed by Climate
Change.

11. # Melting of the Poles &
Rising Sea Level :
1914
Pictured example: Portage Glacier, Alaska
With Global Warning, both of the
poles are warming quickly causing
ice to melt in both regions, as a
result Sea Level is rising.
It also caused by the expansion of
seawater as it warms.

12. # Acidification of the Oceans :
The absorption of too much CO₂
acidifies water causes death and
disease among fish, sea snake,
sea snails, coral and other
organisms in the sea & disrupt
the Marine Ecosystem.

13. # Extreme Weather Phenomena :
Hurricanes, cyclones, typhoons, tornadoes,
drought, floods,heavy rain and snow all
increase in their degree of violence due to
Global Warming causing more deaths,
victims, refugees and material damage.

14. # Risk of Human Extinction :
Because of Climate Change-
● Decline in crop productivity.
● Shortage of drinkable water supply.
● Polluted atmosphere is causing many
diseases like allergies, lung cancer,
stroke, asthma, immune system defects,
premature death etc.
● River, lakes,ocean polluted with toxic
materials.

15. ● Prevention of Climate Change
First, it is important to be clear that climate change cannot be avoided. We can mitigate its
effects and adapt to its consequences.
Here are some effective ways to mitigate Climate Change -
● Power your home with renewable
energy from solar panel or wind turbine.
● Invest in energy efficient appliances.
● Use energy wisely by turning off the
appliance when you aren’t using it.
● Govt. should invest in renewable energy
projects like Hydroelectric Power
Plant,Solar & Wind Power Plant,Biomass.

16. ● Prevention of Climate Change
● Recycling & Waste Manage Management are
important practice to reduce GHG emissions.
● Use fuel efficient vehicle,hybrid or electronic
vehicle to reduce transportation emissions.
● Tree Plantation helps to reduce CO2
● Govt. should take necessary steps & policies
to decrease the production of carbon
emissions.

17. ● Conclusion
Although each action maybe small, if many people make small changes, it will add up to make a
big difference.