You are viewing a free preview of this lesson.
Subscribe to unlock all 13 lessons in this course and every other course on LearningBro.
The taiga may be the world's largest forest biome, but it is under increasing pressure from human activities and climate change. Unlike the Amazon, where deforestation is driven primarily by agriculture, threats to the taiga are dominated by resource extraction — logging, oil and gas drilling, mining and hydroelectric power generation. Added to these direct threats is the looming danger of climate change, which is warming the boreal zone faster than almost any other region on Earth. This lesson examines each threat in detail, with specific case studies and statistics.
The taiga is the world's primary source of softwood — timber from coniferous trees used for construction, furniture, paper, cardboard and packaging. Commercial logging is the most widespread direct threat to the taiga.
Clear-cutting (clear-felling) is the most common method in the taiga. Entire areas of forest are felled at once, rather than selectively removing individual trees:
| Impact | Detail |
|---|---|
| Habitat destruction | Entire ecosystems are removed; animals lose their homes and food sources |
| Soil erosion | Without tree roots and the protective canopy, soil is exposed to wind and rain erosion |
| Water pollution | Logging roads and exposed soil increase sediment runoff into rivers, harming fish populations (especially salmon, which require clean, gravel-bedded streams to spawn) |
| Carbon release | Felled trees release stored carbon when they decompose or are burned; disturbed soils also release carbon |
| Loss of biodiversity | Clear-cut areas support far fewer species than intact forest; recovery can take 80–120 years |
| Fragmentation | Logging roads and cleared patches break the forest into isolated fragments, making it harder for animals like wolverines and lynx (which need large territories) to survive |
Exam Tip: Be able to distinguish between clear-cutting (removing all trees in an area) and selective logging (removing only chosen trees). Clear-cutting is more economically efficient but far more environmentally damaging. This distinction is important for evaluation questions.
Canada's boreal forest is one of the world's largest intact forest ecosystems, but approximately one million hectares are logged each year:
The taiga sits above some of the world's largest reserves of oil and natural gas, and extraction is a major threat.
Russia is one of the world's top three oil producers and the second-largest natural gas producer. Much of this extraction occurs in the taiga:
| Aspect | West Siberian Oil Fields | Athabasca Oil Sands |
|---|---|---|
| Country | Russia | Canada |
| Resource | Oil and natural gas | Bitumen (heavy oil) |
| Method | Pipeline extraction | Open-pit mining and in-situ |
| Area affected | Over 250,000 km of pipeline corridors | ~900 km² of forest destroyed |
| Key environmental impact | ~20,000 pipeline spills per year | Toxic tailings ponds covering 220+ km² |
| Workforce | Hundreds of thousands | ~140,000 direct and indirect jobs |
The taiga contains significant mineral deposits, and mining is expanding as global demand for metals and minerals grows:
Subscribe to continue reading
Get full access to this lesson and all 13 lessons in this course.