Choosing Between Renewable Energy and Fossil Fuels

In a debate about the use of renewable energy sources versus fossil fuels, two scientists presented conflicting viewpoints. Scientist A argues that renewable energy sources, such as wind and solar power, are essential to reduce greenhouse gas emissions and combat climate change. According to Scientist A, these sources are sustainable and have minimal environmental impact once established.

On the other hand, Scientist B believes that fossil fuels are more reliable and currently the most efficient way to meet global energy demands. Scientist B argues that while renewable energy is important, it cannot yet provide a stable energy supply at the scale needed for modern society.

Based on these arguments, which scientist's argument focuses primarily on environmental sustainability?