Explanation:

• Bogs (also called quagmires) are soft, spongy wetlands that accumulate peat– a fossil fuel that is used for heating homes and businesses in northern Europe. They are formed in northern climates, and take thousands of years to develop.
• Bogs also act as carbon sinks, sequestering around 200 million tons of carbon from the environment in Siberia and Scandinavia.
• For centuries, however, they have been drained for extracting peat or for development, leading to the destruction of their delicate ecosystems, including damage to species such as cranes that breed here.
• The world's largest wetland is a series of bogs in the Siberia region of Russia. The Western Siberian Lowlands cover more than a million square kilometers (386,102 square miles).

Hence statements 1,2&3 are correct.