Taiga includes the largest contiguous forests on the planet and make up about percent of all of Earth's forests.

about 30%

Explanation:

Taiga first is also known as boreal forest,it is the world's largest land biome this accumulate to about 30% coverage of all earth forest.

It covers a wide percentage of land

this range from North America,northern contiguous United States, Eurasia, Russia, Norway, Estonia, Scottish Highlands, some lowland/coastal areas of Iceland, northern Kazakhstan, northern Mongolia, and northern Japan.

The trees grown, temperature and length of the growing season are not the same across the word it varies. In North America spruce is majorly found in tiaga while Scandinavian and Finnish consists of spruce, pines and birch.