iran is facing international condemnation for hanging two more people said to have been involved in nationwide protests. the uk called their executions abhorrent. you are watching bbc news. now it's time for click. as cop27 winds up in egypt, this week we'll look at some of the latest tech that is trying to clean up our planet. we'll muster up a mass of moss that's mopping up the mess in the air. that's easy for you to say! we will find out if hydrogen can do the heavy lifting.