A heavy colorless gas CO2 that does not support combustion, dissolves in water to form carbonic acid, is formed especially in animal respiration and in the decay or combustion of animal and vegetable matter, is absorbed from the air by plants in photosynthesis, and is used in the carbonation of beverages (Source: Webster's Dictionary).
Carbon offsetting is the act of mitigating ("offsetting") greenhouse gas emissions. A well-known example is the purchasing of offsets to compensate for the greenhouse gas emissions from personal air travel (Source: Wikipedia).
Climate change refers to the variation in the Earth's global climate or in regional climates over time. It describes changes in the variability or average state of the atmosphere over time scales ranging from decades to millions of years (Source: Wikipedia).
Conservation is the wise use of natural resources (nutrients, minerals, water, plants, animals, etc.). Planned action or non-action to preserve or protect living and non-living resources (Source: Earth911).
A government-backed program helping businesses and individuals protect the environment through superior energy efficiency (Source: EPA).
A fuel (as coal, oil, or natural gas) formed in the earth from plant or animal remains (Source: Merriam Webster's Dictionary).
A term that refers to molecules made up of two ore more atoms of carbon, generally pertains to compounds formed by living organisms (Source: Earth 911).
A term used to describe material that is being reused/recycled after it has been in the consumer's hands (e.g., a newspaper going back to the paper mill to be recycled into new recycled content paper products). (Source: Earth911).
Recyclable materials, also called "recyclables", may originate from a wide range of sources including the home and industry. They include glass, paper, aluminum, asphalt, iron, textiles and plastics. Biodegradable waste, such as food waste or garden waste, is also recyclable with the assistance of micro-organisms through composting or anaerobic digestion (Source: Wikipedia).
Renewable energy effectively utilizes natural resources such as sunlight, wind, tides and geothermal heat, which are naturally replenished. Renewable energy technologies range from solar power, wind power, and hydroelectricity to biomass and biofuels for transportation (Source: Wikipedia).