You have to click because spacebar doesn't work. Click the tree to remove CO2. When you have enough trees, buy the upgrades from the store. I mean, if you want to click space go ahead. The world clicks counter doesn't save unless you stay for a bit before leaving because it takes time to save (maybe you can hit the stop sign and hit the green flag and it will save, idk). Do not hack the project as it will ruin the fun.
UPDATE LOG AND CREDITS: Thanks to the following people for inspiring me to be a scratcher and start actually making projects: @WarFame @Scratchr30 @PKoz2012 @munshiman @De-best-person @The-Shadow @MisterTibbles @TrapDoorMagic1 @Sussydent1969 @drawdee @1vargatuluc Dec. 05, 2022: Thanks to Fuelvin on Youtube (WarFame in Scratch) for the tutorial. This is supposed to be a science project at school for me. Hope you like it! Jan. 9, 2025: I'm adding more upgrades! Be sure to check out Money Clicker too! Clicking the space bar doesn't work anymore, so if you hold space, you detonate a bomb (not that good, though). You can also change the background by pressing keys 1, 2, 3, 4, 5, 6, 7, 8, 9 and 0. Jan. 14, 2025: There are some technical difficulties with the upgrades, may take a while. Sorry for the inconvenience. -_- Jan. 20, 2025: The bomb is better now, but it's still not perfect. Upgraded the upgrades because they were too boring. 14 upgrades now. Jan. 22, 2025: Made a golden tree that gives you 50 clicks and 60 seconds worth of CO2 and I also added a world clicks counter.