The Oakland A’s are getting hit on two fronts by organized opposition to their proposed waterfront ballpark at Howard Terminal.

The politically powerful organization Save the Bay is raising questions about the environmental impacts of the project, and the bar pilots association, whose members steer those huge container ships into the Port of Oakland, say they’ll be blinded by the ballpark’s lights and might run over kayakers hoping to collect home run balls. Then there are the port’s tenants, who are complaining about the impact on traffic.

“This is not a transit-accessible area, so more people will be traveling there in cars, and the more people traveling in cars, the more we contribute to climate change,” Save the Bay Executive Director David Lewis said.

Mike Jacob, vice president of the Pacific Merchant Shipping Association, which represents several of the port’s tenants, said the A’s plan to build a hotel and 4,000 housing units at the site would significantly impact truck movements in and out of the port as well as future industrial uses in the area.

A group including unions and environmental groups as well as Schnitzer Steel warned legislators in a letter Thursday not to relax regulations that could slow or stop the Oakland Athletics from building a 35,000-seat ballpark and ancillary development north of Jack London Square.