Janna, I have often interviewed you for Mia's climate diary. Could you please introduce yourself briefly? Sure! I am Janna Rückert and I am a physicist in Bremen. I enjoy climbing (even though there are few mountains here in the north) and my favourite ice cream flavours are cinnamon (to eat) and sea ice (for research).

I recently learned that there are different types of clouds at different altitudes. Now I want to know more about how clouds are formed.

In our atmosphere, clouds are mainly found at altitudes of up to 12 km.

It’s been raining all day today. I’m sitting with Mika on my favorite yellow couch, pondering how rain actually forms. I decided to call Johannes Quaas. He said, “If we look at weather patterns, rain comes about when moist air converges and the water is squeezed out as rain, so to speak.”

Hi, I'm Mia, I'm 10 years old and I'm from Leipzig. Normally I'm jumping on the trampoline, reading comics, playing games or playing with Mika, my little arctic fox, or with my dwarf rabbits. But since last year, I've been hearing the word "climate change" everywhere, both at school and when my parents talk. There were even big demonstrations in Leipzig - and now I'm a bit curious and want to know more about it.