Practical, globally-scalable and cost-effective technologies  

“Clean Technologies", “Energy Transition” and "Cleantech” are evolving industry definitions for companies and technologies focused on advancing sustainability. Our civiliztion is at a primitive stage of sustainability, and hardly anything we do is actually sustainable, that is an activity that can be replicaated with no negative environmental impact. Most technologies, self-descibed as "sustainable" or "clean", are aspirationally so, and at best, are heading towards that goal.  The traditional sustainability sectors which comprise Clean Technologies are renewable energy, energy storage, energy efficiency,  and environmental remediation. The main sub-categories or subsectors are evolving, and now appear as follows:

Renewable Energy (primary)

• Solar

• Wind

• Geothermal

• Geologic Hydrogen

• Hydroelectric, Wave & Tidal

Energy Efficiency

• Thermal management

• Lighting

• Grid

• Transportation

• Sustainable construction

 Energy Storage

• Carbon-free fuels

• Thermal storage

• Flow & Secondary Batteries

• Hydro & other gravity potentials

Environmental remediation

• Toxic substances reduction

• Wastewater & Potable water treatment

• Recycling

• Solar Radiation Management *

• Arctic Cloud Modification *

• Carbon Dioxide Removal

Many of the segments above have few practical or cost effective solutions in the market today.    The sectors marked "*" are for multilateral & multi-governmental efforts.