Even if you strive for a sustainable lifestyle at home, it may be tempting to avoid thinking about how your travels effect the environment. No one wants to feel guilty on vacation.

But the effects traveling has on the environment are significant. A study published last year by the University of Sydney found global tourism accounts for 8 percent of total carbon emissions, three times higher than thought.

“As global travel is becoming cheaper and more accessible, the usage of airplanes, cruise ships, trains and buses is increasing and giving off a tremendous amount of carbon and other harmful substances,” said Samantha Bray, managing director of the Center for Responsible Travel, a nonprofit organization that supports sustainable tourism practices.

Here are some practical steps travelers can take:

>> Stay in sustainable lodging: “Hotel sustainability practices have grown tremendously in recent years, especially through certification programs that follow international best-practice standards,” Bray said.

The Global Sustainable Tourism Council recognizes certification programs for hotels and tour operators, Bray said. Travelers can visit its site to see lists of these programs, which include The Rainforest Alliance and Earth Check, and hotels that are accredited will typically show a certification logo on their own websites and marketing materials.

>> Respect your hosts: Bray suggests following the mantra of “leave no trace” when visiting a destination, as the creation of solid waste — particularly plastic — has significant effects.

“Travelers can help reduce their waste production by carrying their own reusable bags, straws, utensils and takeaway containers,” Bray said.

Tourists can also choose to spend their money with businesses that source locally.

>> Know your tour operator: Some tour companies are better than others regarding environmental conservation, protecting wildlife, supporting cultural heritage and employing local guides. In general, choose operators that are transparent about their support for the communities they visit.

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