Climate Change refers to long-term shifts in temperatures and weather patterns. These shifts may be natural, such as through variations in the solar cycle. Climate change threatens people with food and water scarcity, increased flooding, extreme heat, more disease, and economic loss. Climate change can be mitigated by reducing greenhouse gas emissions and by enhancing sinks that absorb greenhouse gases from the atmosphere renewable energy is the key to limiting climate change. Reducing energy demand is another major aspect of reducing emissions.
Recycling is the process of converting waste products into reusable materials. Typical materials that are recycled include iron and steel scrap, aluminum cans, glass bottles, paper, wood, and plastics. The materials reused in recycling serve as substitutes for raw materials obtained from such increasingly scarce natural resources as petroleum, natural gas, coal, mineral ores, and trees. Recycling can help reduce the quantities of solid waste deposited in landfills, which have become increasingly expensive. Recycling also reduces the pollution of air, water, and land resulting from waste disposal.
There are two broad types of recycling operations: internal and external.
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