A Systematic Review of Green AI

TL;DR

This systematic review analyzes 98 studies on Green AI, highlighting recent growth, common research themes, and promising energy savings, emphasizing the field's maturity and need for industrial application.

Contribution

It provides a comprehensive overview of Green AI research, identifying key patterns, research strategies, and gaps, and suggests directions for future industrial adoption.

Findings

Green AI research has grown significantly since 2020.

Most studies focus on monitoring, tuning, and benchmarking AI models.

Reported energy savings reach up to 115%, with many over 50%.

Abstract

With the ever-growing adoption of AI-based systems, the carbon footprint of AI is no longer negligible. AI researchers and practitioners are therefore urged to hold themselves accountable for the carbon emissions of the AI models they design and use. This led in recent years to the appearance of researches tackling AI environmental sustainability, a field referred to as Green AI. Despite the rapid growth of interest in the topic, a comprehensive overview of Green AI research is to date still missing. To address this gap, in this paper, we present a systematic review of the Green AI literature. From the analysis of 98 primary studies, different patterns emerge. The topic experienced a considerable growth from 2020 onward. Most studies consider monitoring AI model footprint, tuning hyperparameters to improve model sustainability, or benchmarking models. A mix of position papers, observational studies, and solution papers are present. Most papers focus on the training phase, are algorithm-agnostic or study neural networks, and use image data. Laboratory experiments are the most common research strategy. Reported Green AI energy savings go up to 115%, with savings over 50% being rather common. Industrial parties are involved in Green AI studies, albeit most target academic readers. Green AI tool provisioning is scarce. As a conclusion, the Green AI research field results to have reached a considerable level of maturity. Therefore, from this review emerges that the time is suitable to adopt other Green AI research strategies, and port the numerous promising academic results to industrial practice.