Data to add

[fsolt]

• [x] szazadveg_cc2021 (uses ESS question on climate worry across EU+UK in 2021)
• [x] ypccc_combo 15 years of US data c(2008, 2010:2023)
• [ ] Environmental Consciousness in Germany biennial surveys from 1996 to 2020, but maybe only the most recent four are available in English
• [x] AmericasBarometer env2b asked since 2016
• [x] Flash EB 123 (2002)
• [x] EB 29 (1988) v169
• [x] EB 58 (2002) v568