subsistence

"This suggests these early inhabitants were clearing forests by burning them, in order to create open spaces for subsistence and perhaps cultural activities," said Adeleye.

Prof Mendelson reckons such tools that can simplify the process of reporting, especially for subsistence farmers, are helpful.

An estimated one million subsistence farmers experienced damaged crops and maize supplies in the country are still critically low.

They are one of the last peoples on the planet to live a fully subsistence lifestyle of hunting, foraging and farming.

Salmon haven't historically been seen in large numbers in the Arctic Ocean and its watersheds, but in recent years incidental catches by subsistence fishermen have occasionally surged.