We control our own actions. Our continued individual consumption leads to CO2 emissions. It's in our power to radically reduce our own carbon footprint by scaling back our lives. Not seeking out environmentally-friendly alternatives, but by curbing our out-of-control consumption urges which lie at the heart of this entire mess.
However, this requires painful, life-changing choices for many. Foregoing the house in the burbs for a walkable/rideable commute. Shunning unsustainable locations like Silicon Valley, even if that means reduction in income. Scaling way back on air travel. Avoiding foods grown in rainforest whose consumption encourages deforestation (e.g., coffee). Living far below our means, in other words.
Stop blaming Trump. Rejoining the Paris Accords won't solve the problem. Far more radical adjustments will be needed to prevent even the mildest effects now being predicted.
I want to see people voicing climate change concerns recommending the only thing that audience members can directly control - live a far simpler life and start doing it now. Stop complaining about how impractical this option is. This is what every "leader" is doing, from CEOs to presidents. Act - just like you are expecting others to do so.