| Question | Answer |
| Abstraction | removing water from a source so that it can be used elsewhere |
| Accuracy | how close your measurements are to the true value |
| Aerobic | using oxygen |
| Anomalies | measurements or results that are clearly out of line (they do not fit the pattern) |
| Aquifer | a porous, permeable underground rock such as chalk or sandstone taht contains water in millions of pores |
| Artificial fertilisers | nitrates, phosphates and potassium that are added to the soil to increase crop growth |
| Biodiversity | the number and variety of species within a region |
| Biofuels | renewable energy resources such as energy crops, wood wastes, biogas and biodiesel |
| Birth rate | the ration of live births in an area to the population of that area, usually expressed as 'per thousand (people) per year' |
| Botanic garden | a research institute where rare or important plant species are grown in order to protect the species from extinction |
| By-catch | unwanted species (for example fish, turtles, dolphins) caught in fishing nets. The organisms are then thrown back, dead, into the sea. |
| Captive breeding | the breeding of species in captivity, usually zoos, with the aim of reintroducing the animals back to their original habitat once it is safe to do so |
| Carbon capture and storage | removal of CO2 from waste gases at power stations and then storing it in old oil and gas fields or in old mines |
| Carbon footprint | the environmental impact of the total amount of carbon dioxide and other greenhouse gases, emitted over the full life cycle of the use of a product, service or event by individuals, specific human activities or areas |
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