A heat wave, by definition is a period of time in which the temperatures are higher than normal for that region at that time of year. When high pressure from aloft—10,000-25,000ft remains strong over an area for several days to weeks, heat waves occur. Heat exhaustion, which shows itself in symptoms such as vomiting, diarrhea, headache, nausea, etc. If a heat wave continues for a longer period, crops and forests can become very dry making it possible for forest or brush fires to start and spread. Heat waves happen all over the globe, with serious heat waves occurring yearly in some area of the world. Journey into the heart of Amazonia, with its vast rivers and forests where thousands of plant and animal species live in a delicate balance-a balance that's increasingly threatened by logging, mining, agriculture, roadbuilding, oil and gas drilling. This Ggeothermal power plant in Reykjavik, Iceland, is using their underground reservoirs of steam and hot water to generate electricity and to heat and cool buildings directly.
Geothermal energy has been used for thousands of years in some countries for cooking and heating.
Each energy source has its pros and cons in terms of competitiveness, security of supply and the effects on the environment and climate. Wind power has no fuel costs, no emissions of CO2 and is the fastest growing source of energy in the EU. Biomass is a renewable energy source, and can be anything from energy crops to agricultural or forestry residues and waste. Hydro power harnesses the energy present in the movement of water, and is by far the leading renewable energy source in the EU.

Natural gas is used in a variety of industrial processes and is converted into heat and electricity.
Nuclear power plays a vital role in many European countries due to its security of supply and low CO2 emissions.
An efficient and inexpensive energy source, coal provides stable and large-scale electricity generation.
What might be considered normal temperatures in tropical or warmer regions can be considered a heat wave in areas which normally doesn’t experience that type of heat. This happens both in the Northern and Southern Hemispheres during the summer as the jet stream follows the path of the sun. The air sinks towards the surface under high pressure and then acts as a cap holding in the hot air. People of all ages can suffer the effects of a heat wave, but the ill, very young, elderly, or overweight tend to be affected more severely.
Because the heat is maintained over the period of several days and doesn’t cool down much at night, the running of air conditioning is increased.
Without rain, these fires can sometimes rage for days, causing loss to crops and livelihoods as well as homes and properties. It is simply power derived from the Earth's internal heat.This thermal energy is contained in the rock and fluids beneath Earth's crust. Together we produce heat and electricity from six energy sources; wind, hydro, biomass, nuclear, coal and gas. Even though warnings and advisories are given, people often don’t follow the guidelines in areas as basic as drinking a lot of water.

Deaths related to heat are often hard to count because it affects those already run down, elderly, or sick. To continuously and reliably deliver energy to our society we need a variety of energy sources. When the human body sweats in large amounts, salt and other minerals are lost which have to be replaced. Water or electricity lines can crack, leading to secondary problems such as water shortages, fires, and power outages. Dry steam, the oldest geothermal technology, takes steam out of fractures in the ground and uses it to directly drive a turbine.
The United States is the world's largest producer, and the largest geothermal development in the world is The Geysers north of San Francisco in California. In Iceland, many of the buildings and even swimming pools are heated with geothermal hot water. Iceland has at least 25 active volcanoes and many hot springs and geysers.There are many advantages of geothermal energy. Although geothermal sites are capable of providing heat for many decades, eventually specific locations may cool down.

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