Bill Maher and Steven Colbert become the first honorees on the GrowthBusters podcast’s “Wall of Excellence.” Plus: Why are millennials having fewer children? Maher celebrates the declining birth rate in the over-developed world because it is the single most effective thing you can do to reduce your carbon footprint. On the other hand, Senator Mike Lee thinks having more babies will solve climate change. Thanks to Steven Colbert for a send-up.

Love is in the air on Valentine’s Day, so this seems the perfect time to learn what you can do to green up your wedding. With over 2 million weddings per year just in the U.S., greening your wedding can make a real difference. The Center for Biological Diversity’s Sarah Baillie shares low-impact wedding tips from the new Wildlife-Friendly Wedding Guide. Listen for more tips and information. And by all means get the guide if you have a wedding to plan!

Your choice of wedding location can make a big difference. So can menu choices. Did you know a vegetarian menu has 75% less emissions than a meat-based menu? For a vegan menu the reduction is 90%. And have you considered that renting attire for the wedding party vs. buying can substantially cut your wedding’s impact? Attending a wedding has its share of impacts and costs. According to LendEDU, the average wedding attendee spends $1,386 per wedding. . . .

Yes, they are related. Our business-as-usual response to Hurricane Florence last month starts the conversation. (This episode was recorded before Hurricane Michael devastated the Florida panhandle.) Grace and Dave do also share some good news: climate change is getting more attention (of course the recent IPCC report has turned that volume up to 11, and we’ll discuss that in the next episode).

Also in this episode: Does Dave need to shut up already about using condoms? How reliable are various forms of contraception? A challenge to the top environmental NGOs to start telling the truth about the unsustainability of economic growth. And a politician startles the world by quitting because his government isn’t doing enough about the climate. . . .

July 11 is World Population Day. We recently passed 7.6 billion humans alive on the planet, while scientists’ best estimates place sustainable world population at about 2 billion. This is an important occasion to have a conversation about our procreative choices.

Isn’t it time for the recommendation to go out far and wide that young couples should choose to have no children, or at most one child, until world population coasts back down to a sustainable level? The connection between family size decisions, climate change and carbon footprint has been getting more and more press, so we at GrowthBusters wondered if the time had finally come.

Is the public ready to acknowledge we have a moral responsibility to have fewer children? . . .