The summary provided focuses on the concept of “sustainable development” and its importance in addressing global challenges. It highlights the need for balancing economic growth with environmental protection and social equity. **Detailed Text:**

Sustainable development, a concept gaining increasing prominence in the global discourse, represents a paradigm shift in how we approach development. It transcends the traditional linear model of economic growth at the expense of environmental degradation and social inequality.

The humpback whales, known for their complex social structures and intricate communication systems, are highly intelligent creatures. Their songs, which can last for hours, are a testament to their cognitive abilities. These songs are not just random sounds; they are complex patterns of clicks, whistles, and pulsed calls, each with a specific meaning. The songs are used for a variety of purposes, including communication, navigation, and even mating.