Switching off camera during crocheting

Recently, my mum has taught me crocheting. As we live far apart, we have been using videoconferencing. But I realized that when we are working on our projects, we don't look at each other for a while and only need audio. So, now we switch off the camera during this time, which is worth it: 1 hour with video causes CO2 emissions similar to a 1.7 km car drive (with a fuel-efficient car) - with only audio about 25 times less, just 70 m!