Choose an author ________ you choose a friend.
One of the most popular, very slow and long English summer games played on a green field by two teams of eleven players each is called …
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Mr Hill: «Good morning, I have an appointment with Mr James».
Receptionist: «________________».
Canada’s official national sport in summer is …
Children are allowed to use the swimming pool _______ they are with an adult.
One of Canada’s prominent national symbols is the …
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Renewable energy
1. Renewable energy is energy generated from natural resources. In its various forms, it derives directly from the sun, wind, rain, tides, and geothermal heat. Renewable energy is derived from natural processes that are replenished constantly. Each of these sources has unique characteristics which influence how and where they are used.
2. The majority of renewable energy technologies are powered by the sun. The Earth-Atmosphere system is in equilibrium so that heat radiation into space is equal to incoming solar radiation, the resulting level of energy within the Earth-Atmosphere system can roughly be described as the Earth’s "climate."
3. The hydrosphere absorbs a major fraction of the incoming radiation. Most radiation is absorbed at low latitudes around the equator, but this energy is dissipated around the globe in the form of winds and ocean currents. Wave motion may play a role in the process of transferring mechanical energy between the atmosphere and the ocean through wind stress. Solar energy is also responsible for the distribution of precipitation which is tapped by hydroelectric projects, and for the growth of plants used to create biofuels.
4. While most renewable energy projects and production is large-scale, renewable technologies are also suited to small off-grid applications, sometimes in rural and remote areas, where energy is often crucial in human development. Some renewable energy technologies are criticized for being intermittent or unsightly, yet the renewable energy market continues to grow. Climate change concerns, coupled with high oil prices, peak oil, and increasing government support, are driving increasing renewable energy legislation, incentives and commercialization.
(Encyclopedia Wikipedia)
Can you turn off the light _______ you go out, please?
The guests had arrived _________ the rain began to fall.
On looking through the report I see that your ______ are way over your budget.