The human cost of COVID-19 has been devastating, and so-called lockdown measures  have turned lives upside down. But the pandemic has given us a glimpse of what our world could look like if we took the bold steps that are needed to curb climate change and air pollution. our  air  and water can be cleaner, our streets can be quieter and safer, and many of us have found new ways to work while spending more time with our  families. As some countries start re-open their societies and economies , the question we must answer is whether we will just return to the way things were, or whether we will learn the lessons the pandemic is teaching us about our relationship with our planet. Building back better means building back greener.