Kyoto projects harm ozone layer: U.N. official

By Gerard Wynn

LONDON (Reuters) - The biggest emissions-cutting projects under the Kyoto Protocol on global warming have directly contributed to an increase in the production of gases that destroy the ozone layer, a senior U.N. official says.

In addition, evidence suggests that the same projects, in developing countries, have deliberately raised their emissions of greenhouse gases only to destroy these and therefore claim more carbon credits, said Stanford University's Michael Wara.

Kyoto is meant to curb emissions of the greenhouse gases blamed for global warming, but is undermining a separate pact called the Montreal Protocol, meant to phase out gases which harm the earth's ozone layer.

That layer in the atmosphere shields the planet from damaging ultra-violet rays that can cause skin cancer.

At the heart of the clash is a carbon trading scheme under Kyoto, worth $5 billion last year, whereby rich countries pay poorer ones to cut greenhouse gas emissions on their behalf, called the clean development mechanism (CDM).

The most popular type of project has been to destroy a potent greenhouse gas known as HFC 23, one of a family of so-called hydrofluorocarbons, in China and India.

The problem is that HFC 23 is a waste product in the manufacture of a refrigerant gas which damages the ozone layer, called HCFC 22, and chemical plants have used their CDM profits to ramp up production.

"This is certainly one of the major drivers now in the increase in production of HCFC 22," Rajendra Shende, director of ozone issues at the United Nations Environment Programme, which administers the Montreal Protocol, said on Monday.