9781422274552

INTRODUCTION

A large percentage of electricity and fuels is generated by burning fossil fuels, which release harmful greenhouse gases (GHGs). GHGs cause and increase global warming. In order to reduce these harmful emissions, it is necessary to start saving energy. Moreover, fossil fuels are nonre- newable sources of energy and they are not going to last forever. In the near future, therewill be no fossil fuels to generate electricity and fuel. Hence, it is important that we now look for alternative energy sources for the future.

Sources of Energy Energy is obtained from various sources and is used in different forms. Living things ob- tain energy from the sun in the form of heat and light. Nonliving things such as machines and vehicles get energy from fuels like gaso- line, diesel, electricity, and others. What is Energy? Energy is the ability or capacity to do work. We use energy for lighting homes and cit- ies, powering vehicles, and running facto- ries and industries. Once industries were set up, the energy from fossil fuels came to be used widely. However, the overuse of fossil fuels for generating energy is increas- ing global warming.

CLIMATE CHANGE: Problems and Progress

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