Russia’s Lake Baikal: fears of a Chinese takeover, but pollution, poaching and overtourism are the real threats

• Earth’s biggest, deepest, lake is in big trouble. People there point to Chinese tourists and say China covets Lake Baikal, but its problems lie closer to home
• Pollution of its once pristine waters, and illegal fishing, have taken their toll, as winter trips with a biologist and traditional fishermen reveal