This week's viewer question comes from Renato Monteiro in Brazil.

Meat is, for many people, one of the most important sources of protein. But producing it causes climate-damaging CO2. Could that be used a protein source instead? A Finnish startup believes it can.

In this week's Tomorrow Today, the viewer question comes from José Gabriel Ossa from Colombia.

Diamonds from CO2: Can greenhouse gases be permanently stored in crystalline structures? Dale Vince has developed a technology for countering environmentally destructive diamond mining. DW reporter Ahmand Kalaji asked him about it.

This week's question for Tomorrow Today comes from Antoniete Reyes in El Salvador.

Earth is hit by asteroids all the time. Most of them are very small. But now and again, bigger rocks crash on our planet. They can cause massive destruction. So scientists are looking for ways to defend planet Earth.

How about making fuel out of CO2? With a little water and electricity added. Tim Böltken and his team say they've developed a synthetic fuel that makes use of the greenhouse gas carbon dioxide. The group insists it's fully carbon neutral.

Senegalese academic Cheikh Anta Diop was an anthropologist, historian, physicist, and linguist. His groundbreaking work included rewriting Africa's history from an Afrocentric point of view without prejudice.

This week we answer our viewer's question: Why do people have different skin colors?

The SARS-CoV-2 virus enters the mouth, lungs and intestines – then lands in the toilet. Its trace can be followed all the way to the sewage treatment plant. There it's used not only to detect infections early, but also to track how variants spread.