The adjective life-threatening is used here to describe a situation that is dangerous enough to cause death. In this context, it describes the severe nature of the summer heatwaves.

The noun obligations refers to duties or tasks that people are required to do, such as work. Since the text mentions daily lives, the plural form is used to include various types of responsibilities.

An adaptation (noun) is a change someone makes to deal with a new situation. The plural form is necessary here because the sentence refers to many different ways people change their behavior.

The noun inequalities refers to the unfair differences between groups of people, such as some having more resources than others. This word explains why different people react to heat in different ways.

To highlight (verb) something means to draw special attention to a specific fact or problem. In this sentence, the research is making it clear that governments need to focus on certain issues.

This adverb describes something that happens in a way that is out of proportion or too much compared to others. It explains that young people are dying at a much higher rate than expected.

The adjective outdoor describes work or activities that happen outside rather than inside a building.

If something is accessible (adjective), it is easy for people to reach or use. The text suggests that governments should make sure everyone can easily get to cool places.

The noun ownership is the state of possessing or having something, like an air conditioner. The sentence discusses the increase in the number of people who own these cooling machines.

The noun uptake refers to the rate at which people start to use or accept something new. Here, it describes how many people are actually able to buy and use air conditioning systems.