Developments in green technology.

The most obvious is, of course, solar power (it ABSOLUTELY ROCKS) and new, eco-friendly batteries, but there's so much more:

• Organisms that eat plastic
• Novel recyclable materials
• Reusing industrial waste to produce tons of useful products (personally working on that!)
• Novel eco-friendly fertilizers
• Actually nutritious plant meat and milk substitutes

And so, so much more!

Also, there are a lot of organizational changes that help:

• Recycling is getting more widespread
• FOSS and hacky folks allow electronic devices to live way longer than they otherwise would
• Bans on petroleum-based plastics in many applications propel cleaner alternatives (including clean, renewable plastics like PLA)
• And more again!

We have all it takes to build a sustainable, almost solarpunk world. With enough political will, we can make it happen. It's not "futurism" anymore - it's a reality we can forge here and now.