General & Informative:
* Global Warming: Understanding the Crisis
* The Science of Global Warming: Causes and Impacts
* Climate Change: A Global Challenge
* Global Warming: A Threat to Our Planet and Future
Urgent & Action-Oriented:
* Time to Act: The Urgent Threat of Global Warming
* Fighting for Our Future: Tackling the Climate Crisis
* Climate Change: A Race Against Time
* The Global Warming Emergency: Solutions and Strategies
Specific & Focused:
* The Melting Arctic: A Warning Sign of Global Warming
* Extreme Weather Events: The Impact of Climate Change
* The Rising Sea Levels: A Threat to Coastal Communities
* Global Warming and Food Security: A Looming Crisis
Provocative & Engaging:
* Is Our Planet on Fire? The Reality of Global Warming
* The Climate Change Conundrum: Fact or Fiction?
* Beyond Denial: Facing the Truth about Global Warming
* Our Future in the Balance: The Urgency of Climate Action
The best heading will depend on your target audience, the intended tone of the article, and the specific focus of the content.