I interpret the biblical concept of being a steward of creation to mean living within ecological limits, limiting the overall impact that we have on God's world. I agree that creation has been given to us. It is appropriate to hunt and fish, but species extermination and fisheries collapse, due to exceeding ecological limits, cannot possibly be part of God's plan.There can be absolutely no dispute that humans are changing the world's environment. If the above limits are real, by exceeding them we damage the planet's ability to support life. Exceeding its limits leads to global warming, forest death, drought and famine, fishery collapse, mass extinction and lake death, respectively. To believe in the status quo is to deny the above limits.One of the most important, and dreadful, examples comes from global warming: As the planet warms, Arctic ice melts. When the ice, which used to reflect much sunlight, is gone, the Arctic warms further, thawing the permafrost. This is a tipping point. If the permafrost thaws, it decomposes and releases huge amounts of methane, a far more potent greenhouse gas than carbon dioxide, greatly accelerating global warming. At this point, even a complete cut in human CO2 emissions would be futile; the damage will have been done.