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Tungsten, in particular, is in high demand.

The dark, heat-resistant and super-hard metal is inside the engines of some of the most popular cars in the world. It’s used for screens of computers, phones, tablets and televisions. It helps mobile phones vibrate when they ring. Semiconductor makers use the metal to provide insulation between microscopic layers of circuitry.

Tiger Hill rises above the rain forest in an area ruled by armed FARC fighters more than 220 kilometers (137 miles) from the nearest road, town or police station.

An international panel of scientists has found with near certainty that human activity is the cause of most of the temperature increases of recent decades, and warns that sea levels could conceivably rise by more than three feet by the end of the century if emissions continue at a runaway pace.

“It is extremely likely that human influence on climate caused more than half of the observed increase in global average surface temperature from 1951 to 2010,” the draft report says. “There is high confidence that this has warmed the ocean, melted snow and ice, raised global mean sea level and changed some climate extremes in the second half of the 20th century.”

The draft comes from the Intergovernmental Panel on Climate Change, a body of several hundred scientists that won the Nobel Peace Prize in 2007, along with Al Gore. Its summaries, published every five or six years, are considered the definitive assessment of the risks of climate change, and they influence the actions of governments around the world. Hundreds of billions of dollars are being spent on efforts to reduce greenhouse emissions, for instance, largely on the basis of the group’s findings.