One of the products on display at the show impressed me.

Ecostar Majestic Slates they look and feel like natural slate.
But are manufactured composing up to 80% recycled post-industrial rubber and plastic. These post-industrial materials consist of waste that includes car bumpers, car dashboards and tyres. The manufacture of EcoStar tiles prevents these materials from ending up in landfills. Majestic Slate tiles offer an environmentally friendly, lightweight alternative to traditional slate roofing products and as you can see on photo don't break easily.

Featuring a 50-year Gold Star or limited materials warranty and available with a 100 mph wind warranty. High impact resistance that provides protection from hail, falling branches, foot traffic, ice and snow damage. And Majestic Slate can be installed up to eight times faster than natural stone slate

Goecotech