SEATTLE (AP) - From more devastating wildfires to decreased snow in the mountains, climate change is already affecting Washington's economy, a new report says.

And as temperatures continue to increase, the changes will only become more dramatic: Low-lying areas such as the Skagit River delta will flood as sea levels rise, more people will get asthma as pollution worsens and the state's dairy cows will produce less milk in hotter weather, to cite a few of the report's warnings.

The report was commissioned by the state departments of Ecology and Community Trade and Economic Development, and was researched and written by Climate Leadership Initiative at the University of Oregon, with guidance from Washington economists and scientists.

There are too many variables involved to put a price tag on the impact climate change is already having or will have in the future, the report said.

"Absent focused efforts to reduce greenhouse gas emissions and to prepare, to the extent possible, for the environmental and economic changes that cannot be avoided, damage to our Northwest economy will only increase," Ecology Director Jay Manning said in a news release.

The 119-page report weighs the effects of warmer temperatures on various sectors of the economy, based on predictions that the region's climate will warm half-a-degree per decade over the next several decades, and poses questions for policymakers to consider.

Among the gravest concerns are effects that retreating snowpack in the mountains will have on hydropower generation, drinking water supplies, irrigation for crops and stream flows for salmon. As many as 75 percent of glaciers in the North Cascades could vanish in this century if those warming predictions prove true, the report said.

The average number of large wildfires - those greater than 500 acres - in Washington has already jumped dramatically, from an average of six per year in the 1970s to 21 per year early this decade. The cost of fighting those fires could increase by 50 percent, to $75 million a year, by the 2020s, and could continue to cut into tourist revenues in eastern or central Washington towns like Winthrop and Stehekin.

The warming could also wreak havoc on the state's wine industry, with areas of Eastern Washington becoming too hot to grow prized merlot or syrah grapes, and displacing more of the industry to cooler parts of the state.

Whatcom and Yakima counties could see dairy revenues decline by as much as $6 million a year, the report said. Dairy cows produce about 60 pounds of milk a day under optimal conditions, but produce about a pound less per day for each sustained degree above 68 Fahrenheit.

The report also notes that adapting to and reducing the effects of climate change also present economic opportunities, such as the development of green technologies.