I would like to make a diagram like the below in PowerPoint, but I can't figure out how to draw the curved boxes (like the ones that say "Fishing" or "Trapping" in the chart).
Does anyone have a template I can use or a good method?
I believe this is far beyond the standard charting power of Microsoft Powerpoint (Take a look at posted templates). If you want to complete it in Powerpoint, I would recommend using a combination of
Once you create one text item to your liking, you can copy and paste the result, rather than having to start a new Wordart from scratch.
If you just want to create the chart, regardless of software, I would suggest attempting to create the chart using a suitable vector drawing program such as Inkscape.