By 2040 we will finally be rid of fossil fuels, both homes and businesses can meet their energy needs themselves. In the past 15 years we have accomplished a lot in the field of sustainability. In addition, more trees have been planted and more places have been designated as places where nature can take its own course.
Our food is becoming more local, and supermarkets are trying to stock with homegrown produce/groceries/fruit whenever possible.
Children now get a standard healthy school lunch where sandwiches are not the most important part.
Wars are over and our defense budget is lower in 2040 than it is today.