Nations made progress on a treaty to end plastic pollution as their fourth round of talks finished early Tuesday in Canada.

For the first time in the process, negotiators discussed the text of what is supposed to become a global treaty. Delegates and observers at the Intergovernmental Negotiating Committee on Plastic Pollution called it a welcome sign that talk shifted from ideas to treaty language at this fourth of five scheduled meetings.

From ancient fertilizer methods in Zimbabwe to new greenhouse technology in Somalia, farmers across the heavily agriculture-reliant African continent are looking to the past and future to respond to climate change.

Africa, with the world's youngest population, faces the worst effects of a warming planet while contributing the least to the problem. Farmers are scrambling to make sure the booming population is fed.

Small towns in Oklahoma began a long cleanup Monday after tornadoes flattened homes and buildings and killed four people, including an infant, widening a destructive outbreak of severe weather across the middle of the U.S.

Punishing storms that began late Saturday in Oklahoma injured at least 100 people, damaged a rural hospital, washed out roads and knocked out power to more than 40,000 customers at one point, state officials said. Tornadoes on Friday in Iowa and Nebraska also caused wide destruction and were blamed for one death.

Southeast Asia was coping with a weekslong heat wave on Monday as record-high temperatures led to school closings in several countries and urgent health warnings throughout the region.

Millions of students in all public schools across the Philippines were ordered to stay home Monday after authorities canceled in-person classes for two days. The main advice for everyone, everywhere has been to avoid outdoor activities and drink plenty of water, but the young and the elderly were told to be especially careful.

A dam collapsed in western Kenya early Monday, killing at least 40 people after a wall of water swept through houses and cut off a major road, police said.

The Old Kijabe Dam, located in the Mai Mahiu area of the Great Rift Valley region that is prone to flash floods, collapsed and water spilled downstream, carrying with it mud, rocks and uprooted trees, police official Stephen Kirui told The Associated Press.