Various studies estimate that carbon dioxide (CO₂ ) emissions from making and using digital devices (computers, tablets, smart phones and the infrastructure that supports them)  to be between 2.3 – 3.7 percent of global CO₂ emissions, and it is rising all the time. This is roughly equivalent to the emissions of the entire aviation industry.

The website SafetyDetectives.com has 47 suggestions on how to reduce your “digital emissions”, including

• Reduce Screen Energy
• Don’t Leave Your Device in Sleep Mode
• Prioritize Mobile Use Over Laptop/Computer Use
• Stream on WiFi (Not Mobile Network)
• Turn Off Tracking and Surveillance
• Use Ad Blockers to Stop Being Tracked
• Turn Off Location Tracking Unless You Need It
• Delete Useless Apps
• Clean Up the Cloud
• Download Files and Photos Onto a Hard Drive
• Use Google Drive and Google Photos for Cloud Storage
• Reduce Your Electronic Waste
• Properly Dispose of Devices
• Buy Second Hand
• Cut Back on Video Streaming
• Download Rewatchable Content

For details on these and many suggestions see https://www.safetydetectives.com/blog/how-to-reduce-digital-carbon-footprint/#review-5

Thanks to Olivia Mindzenty for this recommendation.