Final answer:
Jabeen can strengthen her argument by using a hopeful tone, citing success stories like Greta Thunberg's, presenting statistics on climate change, and narrowing the focus to specific actions students can take.
Step-by-step explanation:
Jabeen can make her argument more convincing by adopting a more hopeful and positive tone to encourage fellow students to join the US Youth Climate Strike. It's important to emphasize the success stories of individuals like Greta Thunberg, whose actions have sparked global movements and shown that young people can have a profound impact on driving awareness and change in environmental policies. Jabeen should highlight the power of collective action and how even small efforts, when multiplied across many individuals, can lead to significant progress. Additionally, integrating credible statistics about climate change can bolster the argument by providing concrete evidence of the issue's urgency. To narrow the topic, as with Shawn Krukowski's proposal, Jabeen could focus on specific aspects of climate change or potential solutions that students can get involved in, enhancing the relevance and actionable nature of her speech.