What are some sustainable alternatives to aluminum?

Sustainable alternatives to aluminum include biodegradable materials like bamboo and hemp, which can be used in construction and packaging. Stainless steel is a recyclable metal that can replace aluminum in many applications due to its durability and strength. Recycled aluminum itself is a sustainable option as it requires less energy to produce than new aluminum. Additionally, magnesium and titanium are lightweight metals that can be used in place of aluminum in certain industries. It's important to consider the specific application when choosing an alternative, as each material has its own set of properties and environmental impacts.