Final answer:
The climate activist known for saying she only speaks when necessary due to Asperger's syndrome, OCD, and selective mutism is Greta Thunberg. Thunberg has used her position to impact climate change dialogue despite the challenges of autism spectrum disorder. ASD can affect social skills but also offers unique perspectives, as seen in Thunberg's activism.
Step-by-step explanation:
The climate activist who opened one of her first speeches by saying, "I was diagnosed with Asperger's syndrome, OCD, and selective mutism. That basically means I only speak when I think it's necessary. Now is one of those moments," is Greta Thunberg. As a prominent figure in the fight against climate change, Thunberg has demonstrated that despite the social challenges associated with autism spectrum disorder (ASD), individuals can have a profound impact on public discourse and activism. Her words underscore the importance of selective communication, especially when addressing crucial issues such as climate change.
ASD is a neurodevelopmental disorder that can impede social interaction and communication abilities, with symptoms including difficulties in making eye contact, reading social cues, and feeling empathy. Despite these challenges, many on the spectrum possess strong language skills and do not see their condition as a disorder, but rather as a different way of processing information. This perspective has shaped Thunberg's unique and influential voice in environmental activism as she engages with important concerns, such as the rising carbon-dioxide concentrations threatening our global ecosystem.