I am happy talk about any interesting subject that I come across. But I should probably confine myself to those topics in which I have some expertise.
Books - history, manufacture, binding, restoring, reviews and writing
Gardens - suitable plants, container gardening, compost, rain gardens, plant identification.
Environment - causes and effects of climate change, solutions to environmental problems, restoring water cycles, restoring biodiversity, solar, permaculture.
Fiber arts - paper, knitting and other yarn arts. Embroidery.
Languages - how to learn a foreign language, alphabets.
Travel - how to pack, how to plan a trip. A photo guide to: South Africa, Iran, Cuba, Costa Rica, Madagascar, Guadeloupe, northwest China, India, Istanbul, the Holy Land and others.
Glass - more or less anything you want to know.
Games - nothing digital. Cards (bridge, Canasta, Hearts) Man Jong, board games -make and play.
Talks that I have given in the past, and can give again:
The Climate Reality Project introduction to Climate Change
Can we build a sustainable future?
Restoring small water cycles
The waste we make
Regenerative agriculture and carbon sinks
Compost versus Chemicals
How and why to Compost
Compost as a state of mind
"R" we there yet? (Reduce, re-use and several other r's)