BHP and Rio Tinto show the swings and arrows of China commodity exposure

CEO Andrew Mackenzie says miner's China-focused investment is shifting and its rapid iron ore expansion came at the expense of the overall business.

Global net profits have dropped to $20 billion in the last year, with gold, coal and diversified miners being the worst affected.

Even investors who typically eschew precious metals have been hard-pressed to ignore the platinum industry this year.

EPA's radical new rules make building new coal-fired power plants unfeasible while 15% of existing capacity will be shut down within two years, reducing demand.

With a further $300 billion in coal transportation infrastructure to meet global demand over the next 20 years.

The controversial regulation, which some lawmakers already are trying to block, is one of the most sweeping efforts to tackle global warming by this or any other administration.

After unnerving 7% slide last week, iron ore managed to eke out a small price gain Monday.

The Japanese firm is said to be looking to either acquire the project, or restart it as partner of Vale.

Announced in early May, Russia will sell China $400 billion of natural gas.