Problems associated with plastic bags, use of non-renewable resources, causes difficulties during disposal and affects environmental impacts:
Alternatives:
i) Wooden Cutlery
ii) Muslin pouches
iii) Glass Bottles
iv) Canvas Bag
v) Metal straws
Ban plastic in order to save and preserve the environment and reduce the production of Green house gases.

(i) The objective of this kind of energy is to replace the use of fossil fuels which are mainly made of hydrocarbons and hence result in pollution.
(ii) Renewable source of energy do not result in pollution and we can reuse them.
(iii) We all need to shift to these resource of energy and try to avoid usage of fossil fuels.

i) The top layers of soil contain humus and mineral salts, which are vital for the growth of plants.
ii) Removal of upper layer of soil by wind and water is called soil erosion.
iii) Soil erosion causes a significant loss of humus, nutrients and decrease the fertility of soil.
iv) The direct and primary effect of soil erosion is soil loss and nutrient leaching resulting in reduction of land productivity.
v) Annual floods causes damages to crops, property and lives.
vi) Deforested rain forest soil becomes dry and nutrient-deficient as there is no longer vegetation to hold water and nutrients in place.
vii) Heavy rains further erode soil and saturate waterways with excess nutrients, disrupting the food chains of tropical ecosystems.
viii) Eroded sediments can even change the course of rivers, which suffer from huge deposits of silt from deforestation.
ix) Desertification is another possible consequence of erosion.

(i) Electronic devices: Computers, laptops, mobile phones, printers, monitors, televisions, DVD players, calculators, toys, sport equipments.
(ii) Household electrical appliances: Refrigerators, Washing machine, Microwave oven, mixer grinder, water heater.
(iii) Accessories: Printing cartridges, batteries and chargers

(i) Prohibit killing and hunting of specified animals.
(ii) Constitute sanctuaries, national parks, and closed areas for wild life conservation.

(i) It is used as fuel for cooking
(ii) It is used to run motors and pump sets
(iii) It is used to generate electricity

(i) World Wild life Fund (WWF) for nature
(ii) World Conservation Union (WCN)

Yes. Sun is the ultimate source of energy. Directly or indirectly all forms of energy are got from solar energy examples are discussed below:
(i) Fossil fuels are formed due to the burial of plants and animals.
(ii) Renewable sources of energy are also got indirectly from the sun as follows.
(a) The water in lakes, rivers, evaporates due to solar energy and forms clouds. This brings rainfall.
(b) Wind energy is due to uneven heating of earth's surface by the sun rays.
(c) Solar energy is dependent on sunlight directly.

(i) The kinetic energy possessed by the wind is due to its high speed, that can be converted into mechanical power by wind turbines.
(ii) The wind energy can be used for
(a) Generating electricity
(b) Run water pumps, flour mills etc.
(c) Rotatory motion of windmill is used to draw water from wells.
Working of wind mills:
(i) Wind mill is a machine that converts the energy of wind into rotational energy by broad blade attached to the rotating axis.
(ii) When the blowing air strikes the blades of the windmill, it exerts force and causes the blades to rotate.
(iii) The rotational movement of the blades operate the generator and the electricity is produced.
(iv) The energy output from each windmill is coupled together to get electricity on a commercial scale.
Advantage of wind energy:
(i) Wind energy is free, eco-friendly, renewable source of energy.
(ii) It does not cause pollution.
(iii) Expenses on periodic maintenance is low when compared to the other power sources

The various devices used for harvesting sun's energy are called solar energy devices.
Solar cells:
(i) Solar cells (Photovoltaic devices) is made up of silicon that converts sunlight directly into electricity.
(ii) Solar cell produces electricity without polluting the environment.
(iii) Since it uses no fuel other than sunlight, no harmful gases, no burning and no wastes are produced. These can be installed in remote and inaccessible areas (forests and hilly regions) where setting up of power plant is expensive
Uses of Solar cells:
(i) It can be used for street lighting, traffic signals, water pumping, battery charging system etc.
(ii) It is used in artificial satellites and space probes.
(iii) It provides radio and TV transmission to remote areas
(iv) It is used in calculators, electronic toys and watches.

Biogas is the mixture of methane (nearly 75 %), hydrogen sulphide, carbon dioxide and hydrogen. It is produced by the decomposition of animal wastes (cow dung) and plant wastes in the absence of oxygen. It is also commonly called as 'Gobar gas' since the starting material used is cow dung called as gobar.
Uses of biogas:
(i) It is used as fuel for cooking.
(ii) It is used to run motors and pump sets.
(iii) It is used to generate electricity.
Advantages of biogas:
(i) It burns without smoke and therefore causes less pollution.
(ii) An excellent way to get rid of organic wastes like bio-waste and sewage material.
(iii) Left over slurry is good manure rich in nitrogen and phosphorus
(iv) It is safe and convenient to use.
(v) It can reduce the amount of greenhouse gases emitted.