The nature of the problems government must address also contributes to gridlock. Some problems are so complex technically or economically that policy actors cannot easily find feasible and effective solutions, even if they are motivated to do so. Global climate change is a good example. Scientists may disagree about the seriousness of the challenge faced; at what point the consequences, such as rising temperatures or a greater frequency of storms, may become severe; and the cost of taking action, such as cutting back on the use of fossil fuels.