Left-libertarians of the Steiner–Vallentyne type hold that it is illegitimate for anyone to claim private ownership of natural resources to the detriment of others. These left-libertarians support some form of income redistribution on the grounds of a claim by each individual to be entitled to an equal share of natural resources. Unappropriated natural resources are either unowned or owned in common and private appropriation is only legitimate if everyone can appropriate an equal amount or if private appropriation is taxed to compensate those who are excluded from natural resources.