According to NASA data and satellite photos from the last 40 years the Sahara
was severely over grazed by cattle. Try to convince people who translate herd
size into wealth that they are causing global events by how many cows they
have! I don't know what island you are on but pictures from space years ago
clearly showed replacement of green land into desert sand. In turn the winds
can be seen picking up the sand and moving it as far as the west coast of
south america. Staggering yet plausible.
Also, what information can you share on the decay of seaweed from the oceans?