As the annual job search for seniors and graduate students heats up, employers in green tech fields are leveraging alumni connections and flocking to Harvard to court students for jobs.

“Green” employers are zeroing in on future hires who have the right mix of talent and flexibility to find success during difficult economic times.

“The threat of budget cuts definitely looms large over our sector, as it does over many sectors, but we’re optimistic,” said Walter Frick, communications manager at New England Clean Energy Council, who staffed a table at the expo.

“It’s great to have a technical student who can also communicate to a lay audience,” Frick said. “That’s one of the big things that we think Harvard students are likely to be able to do.”

Frick’s organization was among more than 30 employers that filled the Radcliffe Gym on Feb. 25 at the Office of Career Services‘ second annual Energy and Environment Expo, all of them eager to tap Harvard’s thinkers, communicators, and innovators for full-time positions or internships.