A small ecosystem in the boreal forest might look something like this : in the summertime , trees in forests ( that produce oxygen used by living things through photosynthesis ) lower the temperature in the forest for communities in the hot summer months .
Greenhouse gas emissions of tar sands crude are 40 % higher than conventional oil , and the open-pit mining has devastated alberta 's boreal forest .
焦油砂的温室气体排放量比普通石油高40%,露天采矿已经极大地破坏了阿尔伯塔的北方气候带森林。
For a party closely tied to the oil industry , the conservatives-who won a majority on may 2nd after five years of minority government-have been surprisingly progressive in protecting boreal land .
Microscopic animals that live in soils are as diverse in the tropical forests of costa rica as they are in the arid grasslands of kenya , or the tundra and boreal forests of alaska and sweden .
There are also some ecosystems , such as the boreal forests of canada and siberia and the amazon rainforest , which are huge absorbers of carbon dioxide , but which are changing rapidly because of temperature increases and deforestation .