Stephanie and Dave learn about climate activism with Extinction Rebellion, sharing quirky sustainability life hacks on social media, and the joy of a 58-hour train trip – from Stephanie’s former co-worker and friend, James Comiskey.

More men are stepping up and taking responsibility for avoiding unplanned parenthood. Dave celebrates this trend as he shares GrowthBusters plans for the new year in this special year-end mini-episode.

Examining news coverage and commentaries about human population passing 8 billion on November 15, we unpack the reasons far too many of us avoid discourse about human overpopulation.

While Elon Musk erroneously claims population collapse is our biggest worry, world population is hitting 8 billion, adding the latest billion faster than any time in history.

World population may peak this decade and start dropping, over 60% of Coloradans are fed up with the negative consequences of growth of their communities, a new online community and resource for sustainability advocates, Elon Musk keeps populating our conversations, and should Dave run for President of the U.S.?