You have Two Choices
Booked a flight on Jetstar recently. After scrolling through lots of unwanted 'upsells', car-hire, travel insurance, food onboard I was asked if I wanted to pay for the big one:
Please indicate if you would like to offset the carbon emissions for your trip before continuingThe two options given were: "No thanks" and "Yes please". Very polite to be sure but missing a third option: "Absolutely not, are you kidding?"