You don't know where to begin. Your stakeholders (shareholders, employees, customers, and more) are asking you to find tangible, tactical ways that you can increase your ESG (environmental, sustainable, and governance) engagement on a strategic basis that is also aligned directly to your day-to-day operations and objectives.
Good news - the For Good, For Travel methodology gives you a simple way to start down a path of supporting sustainable travel initiatives in your budget.
Here's an example: You're opening a new regional sales office in Canada and you'll be sending employees there fairly often. Sustainability is important to you so you think about the carbon footprint of all of those flights. But you're bidding on local contracts so you want to show additional localized support that stays in the community. Enter For Good, For Travel...

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The For Good, For Travel methodology suggests that you equate that 22% into $22 and use it as a minimum daily travel donation suggestion.
You take a look at your project plan and calculate that, over the course of the next budget year, 2 of your employees will each be spending 20 days each in Canada - a total of 40 employee days.
You multiple 40 days x $22 per day and you get $880.
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While your employees are traveling in Canada, encourage them to keep Goal 13: Combat Climate Change in mind. That means walking (instead of driving) whenever possible, asking their server to not use plastic straws (a single-use plastic) in their drinks, taking direct flights instead of connecting flights (to save on carbon emissions) and more.
Every bit counts when you're a global citizen.