Carbon sequestration is the process of capturing and storing CO₂ which reduces the amount of CO₂ in the atmosphere with a goal of reducing global climate change.

In-situ conservation	Ex-situ conservation
Conservation of species In their natural habitat. E.g: Biosphere reserves	Conservation of species outside their natural habitat. E.g: Zoological parks

Social forestry refers to the management of forests and afforestation on barren lands with the purpose of helping the environmental, social and rural development and benefits.

Dobson Unit is the unit of measurement for total ozone. One DU is the number of molecules of ozone that would be required to create a layer of pure ozone 0.01 millimeter thick at a temperature of 0° C and a pressure of 1 atmosphere.

The increase in mean global temperature due to increased concentration of greenhouse gases 

(a) Trees provide micro climate for crops and maintain O₂ - CO₂ balance atmospheric temperature & relative humidity
(b) Suitable for dry land where rainfall is minimum hence it is a good system for alternate land use pattern

CSS - Carbon Capture and Storage.

The decline in the thickness of the ozone layer over the restricted area is called the Ozone hole.

Lakes as storage of rainwater provide drinking water, improves groundwater level and preserve the fresh water bio-diversity and habitat of the area wherein occurs.
In terms of services, lakes offer sustainable solutions to key issues of water management and climatic influences and benefits like nutrient retention, influencing local rainfall, removal of pollutants, phosphorous and nitrogen and carbon sequestration.

(i) Coal based power plants, by the burning of fossil fuels for electricity generation.
(ii) Combustion of fuels in the engines of automobiles, commercial vehicles, and air planes contribute the most of global warming.
(iii) Agricultural practices like stubble burning result in emission of CO₂.

(i) Rise in global temperature which causes sea levels to rise as polar ice caps and glaciers begin to melt causing submergence of many coastal cities in many parts of the world.
(ii) There will be a drastic change in weather patterns bringing more floods or droughts in some areas.
(iii) Biological diversity may get modified, some species ranges get redefined. Tropics and sub-tropics may face the problem of decreased food production.

(i) They help for detailed floristic and faunistic studies
(ii) These groves provide a number of ecosystem services to the neighborhood like protecting watershed, fodder, medicinal plants and microclimate control