We need trade that is fair and environmentally sustainable: "fair-sustainable trade". By fair I mean trade that doesn't give an advantage to countries with cheap labor. By environmentally sustainable I mean trade that doesn't give an advantage to countries with weak environmental protections.
We could do this by giving each country a score, like in school: A, B, C, D, or F on both labor standards and environmental protection. The countries that score As on both would be able to trade with us with no tariffs. The countries that scored the lowest would face the highest tariffs when they export to us.
We could start ourselves and then spread this idea around by negotiations and better trade treaties. It's a good approach because it protects American products from imports made in countries with cheaper labor and weak environmental protections while allowing free competition among products that were made under roughly equal conditions.
To sum up, we need fair-sustainable trade, not tariffless trade.