The technologies we use have long changed how we communicate. But on today's social media platforms, where content moderation is automated, people have taken to speaking in code to elude algorithmic censors. And it's changing the way we speak.

We've long talked about the data-driven turn in AI and how a Deep Learning approach has given us everything from image recognition, to ChatGPT. But what about the ongoing ethical questions about the kinds of data machines are learning on? And beyond that, what if we're starting to…run out of data?

The climate is changing. So are we. On What On Earth, you’ll explore a world of solutions with host Laura Lynch and our team of journalists. In 1970, 20 million people showed up to fight for the environment on the first Earth Day. More than five decades later, is it time for this much tamer global event to return to its radical roots?

OG organizer Denis Hayes recounts how – amidst other counterculture movements at the time – his team persuaded roughly one in ten Americans to take to the streets. As he approaches 80, Denis offers his singular piece of advice to the next generation of climate leaders. Then, environmental warriors Maria Blancas and Axcelle Campana share ideas on what a reinspired Earth Day could look like – including making it a public holiday.

More episodes of What On Earth are available at: https://link.chtbl.com/fHfXfjAJ

We love to hear from our listeners and regularly feature them on the show. Have a question or idea? Email Earth@cbc.ca