By Yael T. Abouhalkah, Kansas City Star Editorial Page columnist

After years of planning, backers of a new climate change treaty see disaster looming early next month in Copenhagen.

The main reason: There's no leadership from two major polluters -- America and China -- to establish tougher limits on harmful greenhouse emissions that are causing global warming.

That could turn the United Nations Climate Change Conference into a public relations disaster for scientists, environmentalists and others pushing for needed changes on how industry pollutes the air.

President Barack Obama, once thought to be a strong supporter of needed limits, has backed away from that position. The obvious reason is his concern about how new requirements on industry could affect the economy.

And China seems determined to press ahead full-speed with its construction of coal plants to power the nation, with those coal plants not nearly as efficient as they could be.

As a sidelight, conservatives have hopped all over some stolen e-mails from scientists, which they say indicate global warming may not be as big a problem as those scientists claim.

All in all, the Copenhagen talks could fail in their original mission, big time.