When he was a 20-week-old embryo -- before he even had a real name -- Choi Hee-woo became one of the world's youngest-ever plaintiffs by joining a groundbreaking climate lawsuit against South Korea. His case, known as "Woodpecker et al. v. South Korea" after Choi's in utero nickname, seeks to prove Seoul's modest climate goals -- reducing carbon emissions by 40 percent of 2018 levels by 2030 -- are a violation of constitutionally guaranteed human rights. IMAGES AND SOUNDBITES