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...physical ocean atmosphere parts of the climate, where our best guess might still be they could give you 3 degrees warming if you doubled the carbon level in the atmosphere, but if we think about longer-term parts of the system, the melt of ice sheets, the response of the earth’s carbon cycle, the great carbon stores, especially in the land soils and in the ocean, then...

...physical environment. You'll learn more about ecosystems if you work through the remaining units in this series. A variety of orders of placental mammals exist. Taxonomists argue a great deal about the evolutionary origins of these different groups and how the taxonomic boundaries ought to be drawn, so the exact number of mammalian orders varies from 19 to 27, depending...

...physical and biological elements; (e) context or ‘space’. In each case the word environment or environmental seemed to be used in a broad sense so I didn’t find it easy to find substitutable words. However, there were different emphases and adjectives in each paragraph so I deduced that the words had different meanings, dependent on the context within which they...