Check out Remote keynote offer (because the world needs less business trips) by Henrik Kniberg. Here is an excerpt:
OK here’s an offer to any conference organizer in the lean/agile/tech/climate space. I get a lot of requests to do conference keynotes, which I’m grateful for, but unfortunately I have to turn down the vast majority. I limit long-distance travel for family reasons, and also for climate reasons…
The full article is available here.