Global warming-Human Geography

1. Global Warming and Climate Change:Global Warming and Climate Change:
Impact on BangladeshImpact on Bangladesh
Dr. M. Maksudur RahmanDr. M. Maksudur Rahman
Department of Geography and EnvironmentDepartment of Geography and Environment
University of DhakaUniversity of Dhaka

2. Structure of the LectureStructure of the Lecture
 Definition: Global WarmingDefinition: Global Warming
 Why Global Warming happening?Why Global Warming happening?
 Effects of Global WarmingEffects of Global Warming
 Economic and Political Debate of Global warmingEconomic and Political Debate of Global warming
 Climate Change: Is Global Warming a factor for the ClimateClimate Change: Is Global Warming a factor for the Climate
Change?Change?
 Effects and Key Risks of Global Warming and ClimateEffects and Key Risks of Global Warming and Climate
Change on BangladeshChange on Bangladesh
 Impact of Global Warming and Climate Change onImpact of Global Warming and Climate Change on
BangladeshBangladesh
 Conclusions: Response to Global Warming and ClimateConclusions: Response to Global Warming and Climate
ChangeChange

3. Global Warming: Definition and CausesGlobal Warming: Definition and Causes
 Global warming is the increase in the temperature of theGlobal warming is the increase in the temperature of the
Earth’s near-surface air and oceans since the mid-20Earth’s near-surface air and oceans since the mid-20thth
centurycentury
and its projected continuation. Global surface temperatureand its projected continuation. Global surface temperature
increased 0.18 degree centigrade during the last century.increased 0.18 degree centigrade during the last century.
 Why global warming happening?Why global warming happening?
According to Intergovernmental Panel on Climate Change (IPCC)-According to Intergovernmental Panel on Climate Change (IPCC)-
 Increasing green house gas concentrationsIncreasing green house gas concentrations resulting from humanresulting from human
activities such asactivities such as fossil fuel burning and deforestationfossil fuel burning and deforestation are responsibleare responsible
for most of the observed temperature increasefor most of the observed temperature increase since the middle of thesince the middle of the
2020thth
century.century.
 Natural phenomenaNatural phenomena such as solar variation and volcanoes producedsuch as solar variation and volcanoes produced
most of the warming from pre-industrial times to 1950.most of the warming from pre-industrial times to 1950.

4. Effects of Global WarmingEffects of Global Warming
Feedback EffectsFeedback Effects
 Water vapour feedbackWater vapour feedback
 Cloud feedbackCloud feedback
 Ice-albedo feedbackIce-albedo feedback
Effects on Natural Environment and Human LifeEffects on Natural Environment and Human Life
 Glacier retreatGlacier retreat
 Ice shelf disruptionIce shelf disruption
 Worldwide sea level riseWorldwide sea level rise
 Changes in rainfall patternsChanges in rainfall patterns
 Increased intensity and frequency of extreme weather eventsIncreased intensity and frequency of extreme weather events
 Changes in crop yields and species extinctionsChanges in crop yields and species extinctions
 Changes in the range of disease vectorsChanges in the range of disease vectors

5. Economic and Political Debate of GlobalEconomic and Political Debate of Global
warmingwarming
 Poor regions such as Bangladesh appear at the greatest riskPoor regions such as Bangladesh appear at the greatest risk
from the projected effect of global warming, while theirfrom the projected effect of global warming, while their
emissions have been small compared to the developed world.emissions have been small compared to the developed world.
 Kyoto protocol –Kyoto protocol – criticized by USA and Australia, while in thecriticized by USA and Australia, while in the
western world, the idea of human influence on climate haswestern world, the idea of human influence on climate has
gained wider public acceptance in Europe than in the USA.gained wider public acceptance in Europe than in the USA.
 Debate between environmental organizations and Business-Debate between environmental organizations and Business-
centred organizations and companies on climate change due tocentred organizations and companies on climate change due to
global warming.global warming.

6. Climate Change: Is Global Warming a factor forClimate Change: Is Global Warming a factor for
the Climate Change?the Climate Change?
 What is Climate Change?What is Climate Change?
 Climate changeClimate change is any long-term change in the patterns of average weatheris any long-term change in the patterns of average weather
of a specific region or the Earth as whole. It reflects abnormal variations toof a specific region or the Earth as whole. It reflects abnormal variations to
the Earth’s climate and subsequent effect on other parts of the Earth.the Earth’s climate and subsequent effect on other parts of the Earth.
 Climate change factors:Climate change factors:
 Plate TectonicsPlate Tectonics
 Solar OutputSolar Output
 VolcanismVolcanism
 Human InfluencesHuman Influences
 Evidences for climate changeEvidences for climate change
 Glacial geologyGlacial geology
 VegetationVegetation
 DendrochronologyDendrochronology
 Pollen analysisPollen analysis
 Sea level changesSea level changes

7. Effects and Key Risks of Global Warming and ClimateEffects and Key Risks of Global Warming and Climate
Change on BangladeshChange on Bangladesh
 Temperature riseTemperature rise
 Evaporation riseEvaporation rise
 Changes in precipitationChanges in precipitation
 Reduced fresh water availabilityReduced fresh water availability
 Surface drainage congestionSurface drainage congestion
 Sea level riseSea level rise
 Saline water intrusion into the estuaries and coastal beltsSaline water intrusion into the estuaries and coastal belts
 Increased floods and coastal stormsIncreased floods and coastal storms
 Increased bank erosion and bed level changes of rivers andIncreased bank erosion and bed level changes of rivers and
coastal areascoastal areas
 Changes in cross boundary river flowsChanges in cross boundary river flows

8. Impact of Climate Change on BangladeshImpact of Climate Change on Bangladesh
Five sectors have been identified as most relevant to BangladeshFive sectors have been identified as most relevant to Bangladesh
in relation to climate change impact:in relation to climate change impact:
 Coastal resourcesCoastal resources
 Fresh water resourcesFresh water resources
 AgricultureAgriculture
 Ecosystem and biodiversityEcosystem and biodiversity
 Human healthHuman health

9. Conclusions: Response to Global Warming andConclusions: Response to Global Warming and
Climate ChangeClimate Change
AdaptationsAdaptations
 Coordinated institutional supportCoordinated institutional support
 Integrated planningIntegrated planning
 Information managementInformation management
 Research, analysis and data provision about climate changeResearch, analysis and data provision about climate change
 Prepare practical guidelines on climate change issues in planningPrepare practical guidelines on climate change issues in planning
 Climate Change Impact Assessment (CCIA)Climate Change Impact Assessment (CCIA)
 Development of Climate Change Knowledge baseDevelopment of Climate Change Knowledge base
 Awareness building and disseminationAwareness building and dissemination
 International activitiesInternational activities

10. Thanks for your attention.Thanks for your attention.